|
Fair Value - Quantitative Disclosure for Assets Classified as Level 3 (Detail) (USD $)
In Thousands, unless otherwise specified
|
12 Months Ended |
|
Dec. 31, 2014
|
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
|
| Balance at December 31, 2013 |
$ 7,513 |
| Gains included in net income |
85 |
| Gains included in comprehensive income |
47 |
| Investments and capital calls |
3,080 |
| Distributions received |
(195) |
| Balance at December 31, 2014 |
10,530 |
| Common Stock at Fair Value [Member] |
|
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
|
| Gains included in comprehensive income |
47 |
| Investments and capital calls |
900 |
| Balance at December 31, 2014 |
947 |
| Net Asset Value [Member] |
|
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
|
| Balance at December 31, 2013 |
3,314 |
| Gains included in net income |
81 |
| Investments and capital calls |
2,180 |
| Distributions received |
(195) |
| Balance at December 31, 2014 |
5,380 |
| Equity Method [Member] |
|
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
|
| Balance at December 31, 2013 |
4,199 |
| Gains included in net income |
4 |
| Balance at December 31, 2014 |
$ 4,203 |