|
Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Detail) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified
|
Sep. 30, 2014
|
Dec. 31, 2013
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
$ 2,776,642 |
|
$ 2,653,006 |
|
| Percentage Of Assets Fair Value Disclosure |
100.00% |
|
100.00% |
|
| Financial and Nonfinancial Liabilities, Fair Value Disclosure |
2,538 |
|
4,703 |
|
|
Level 1
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
17,649 |
|
17,270 |
|
| Percentage Of Assets Fair Value Disclosure |
1.00% |
|
1.00% |
|
| Financial and Nonfinancial Liabilities, Fair Value Disclosure |
0 |
|
0 |
|
|
Level 2
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
2,757,779 |
|
2,634,303 |
|
| Percentage Of Assets Fair Value Disclosure |
99.00% |
|
99.00% |
|
| Financial and Nonfinancial Liabilities, Fair Value Disclosure |
0 |
|
0 |
|
|
Level 3
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
1,214 |
|
1,433 |
|
| Percentage Of Assets Fair Value Disclosure |
0.00% |
|
0.00% |
|
| Financial and Nonfinancial Liabilities, Fair Value Disclosure |
2,538 |
|
4,703 |
|
|
Liability
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Financial and Nonfinancial Liabilities, Fair Value Disclosure |
2,538 |
|
4,703 |
|
|
Liability | Level 1
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Financial and Nonfinancial Liabilities, Fair Value Disclosure |
0 |
|
0 |
|
|
Liability | Level 2
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Financial and Nonfinancial Liabilities, Fair Value Disclosure |
0 |
|
0 |
|
|
Liability | Level 3
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Financial and Nonfinancial Liabilities, Fair Value Disclosure |
2,538 |
|
4,703 |
|
|
U.S. Treasury securities and obligations of U.S. Government
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
171,435 |
|
139,020 |
|
|
U.S. Treasury securities and obligations of U.S. Government | Level 1
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
12,301 |
|
12,458 |
|
|
U.S. Treasury securities and obligations of U.S. Government | Level 2
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
159,134 |
|
126,562 |
|
|
U.S. Treasury securities and obligations of U.S. Government | Level 3
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
0 |
|
0 |
|
|
Federal agencies
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
22,223 |
[1] |
22,068 |
[1] |
|
Federal agencies | Level 1
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
0 |
[1] |
0 |
[1] |
|
Federal agencies | Level 2
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
22,223 |
[1] |
22,068 |
[1] |
|
Federal agencies | Level 3
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
0 |
[1] |
0 |
[1] |
|
Federal agency issued residential mortgage-backed securities
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
51,557 |
[1] |
62,128 |
[1] |
|
Federal agency issued residential mortgage-backed securities | Level 1
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
0 |
[1] |
0 |
[1] |
|
Federal agency issued residential mortgage-backed securities | Level 2
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
51,557 |
[1] |
62,128 |
[1] |
|
Federal agency issued residential mortgage-backed securities | Level 3
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
0 |
[1] |
0 |
[1] |
|
U.S. Treasury and Government, Subtotal
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
245,215 |
|
223,216 |
|
|
U.S. Treasury and Government, Subtotal | Level 1
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
12,301 |
|
12,458 |
|
|
U.S. Treasury and Government, Subtotal | Level 2
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
232,914 |
|
210,758 |
|
|
U.S. Treasury and Government, Subtotal | Level 3
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
0 |
|
0 |
|
|
Industrial
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
559,145 |
|
534,779 |
|
|
Industrial | Level 1
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
0 |
|
0 |
|
|
Industrial | Level 2
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
559,145 |
|
534,779 |
|
|
Industrial | Level 3
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
0 |
|
0 |
|
|
Energy
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
239,397 |
|
222,745 |
|
|
Energy | Level 1
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
0 |
|
0 |
|
|
Energy | Level 2
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
239,397 |
|
222,745 |
|
|
Energy | Level 3
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
0 |
|
0 |
|
|
Communications and technology
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
243,429 |
|
233,543 |
|
|
Communications and technology | Level 1
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
0 |
|
0 |
|
|
Communications and technology | Level 2
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
243,429 |
|
233,543 |
|
|
Communications and technology | Level 3
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
0 |
|
0 |
|
|
Financial
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
293,743 |
|
283,477 |
|
|
Financial | Level 1
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
0 |
|
0 |
|
|
Financial | Level 2
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
293,743 |
|
283,477 |
|
|
Financial | Level 3
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
0 |
|
0 |
|
|
Consumer
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
538,301 |
|
493,756 |
|
|
Consumer | Level 1
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
0 |
|
0 |
|
|
Consumer | Level 2
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
538,301 |
|
493,756 |
|
|
Consumer | Level 3
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
0 |
|
0 |
|
|
Public utilities
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
265,030 |
|
252,377 |
|
|
Public utilities | Level 1
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
0 |
|
0 |
|
|
Public utilities | Level 2
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
265,030 |
|
252,364 |
|
|
Public utilities | Level 3
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
0 |
|
13 |
|
|
Corporate obligations, subtotal
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
2,139,045 |
|
2,020,677 |
|
|
Corporate obligations, subtotal | Level 1
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
0 |
|
0 |
|
|
Corporate obligations, subtotal | Level 2
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
2,139,045 |
|
2,020,664 |
|
|
Corporate obligations, subtotal | Level 3
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
0 |
|
13 |
|
|
Corporate private-labeled residential mortgage-backed securities
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
100,429 |
|
116,482 |
|
|
Corporate private-labeled residential mortgage-backed securities | Level 1
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
0 |
|
0 |
|
|
Corporate private-labeled residential mortgage-backed securities | Level 2
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
100,429 |
|
116,482 |
|
|
Corporate private-labeled residential mortgage-backed securities | Level 3
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
0 |
|
0 |
|
|
Municipal securities
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
154,178 |
|
147,619 |
|
|
Municipal securities | Level 1
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
0 |
|
0 |
|
|
Municipal securities | Level 2
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
154,178 |
|
147,619 |
|
|
Municipal securities | Level 3
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
0 |
|
0 |
|
|
Other
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
96,346 |
|
97,874 |
|
|
Other | Level 1
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
0 |
|
0 |
|
|
Other | Level 2
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
95,132 |
|
96,454 |
|
|
Other | Level 3
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
1,214 |
|
1,420 |
|
|
Redeemable preferred stocks
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
16,703 |
|
12,752 |
|
|
Redeemable preferred stocks | Level 1
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
0 |
|
0 |
|
|
Redeemable preferred stocks | Level 2
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
16,703 |
|
12,752 |
|
|
Redeemable preferred stocks | Level 3
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
0 |
|
0 |
|
|
Fixed maturity securities
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
2,751,916 |
|
2,618,620 |
|
|
Fixed maturity securities | Level 1
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
12,301 |
|
12,458 |
|
|
Fixed maturity securities | Level 2
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
2,738,401 |
|
2,604,729 |
|
|
Fixed maturity securities | Level 3
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
1,214 |
|
1,433 |
|
|
Equity securities
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
24,726 |
|
|
|
|
Equity securities | Level 1
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
5,348 |
|
|
|
|
Equity securities | Level 2
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
19,378 |
|
|
|
|
Equity securities | Level 3
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
0 |
|
|
|
|
Equity Securities and Other Invested Assets [Member]
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
|
|
34,386 |
|
|
Equity Securities and Other Invested Assets [Member] | Level 1
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
|
|
4,812 |
|
|
Equity Securities and Other Invested Assets [Member] | Level 2
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
|
|
29,574 |
|
|
Equity Securities and Other Invested Assets [Member] | Level 3
|
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Investments, Fair Value Disclosure |
|
|
$ 0 |
|
|
|
|