Investments in Debt and Equity Securities - Additional Information (Detail) - USD ($)
$ in Thousands |
3 Months Ended |
9 Months Ended |
|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
Dec. 31, 2015 |
| Schedule Of Trading Securities And Other Trading Assets [Line Items] |
|
|
|
|
|
| Available for sale investments gross pre-tax unrealized gain (loss) |
$ 4,934
|
|
$ 4,934
|
|
$ 2,589
|
| Unrealized gain (losses) on investments, net of tax |
1,121
|
$ (1,651)
|
1,988
|
$ (1,368)
|
|
| Proceeds from sale of investments available for sale debt securities |
|
|
4,645
|
|
|
| Proceeds from sale of investments available for sale |
|
|
|
1,961
|
|
| Pre tax reclassification of net investment realized gain (loss) into net income |
|
|
233
|
617
|
|
| Reclassification of net investment realized gain (loss) into net income, net of tax |
|
|
143
|
$ 376
|
|
| HealthCare Partners (HCP) |
|
|
|
|
|
| Schedule Of Trading Securities And Other Trading Assets [Line Items] |
|
|
|
|
|
| Required minimum cash balance |
$ 58,127
|
|
58,127
|
|
|
| Certificates of deposit, commercial paper and money market funds |
|
|
|
|
|
| Schedule Of Trading Securities And Other Trading Assets [Line Items] |
|
|
|
|
|
| Unrealized gain (losses) on investments, pre tax |
|
|
2,578
|
|
|
| Unrealized gain (losses) on investments, net of tax |
|
|
$ 1,781
|
|
|