Investments in Debt and Equity Securities - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Available for sale investments gross pre-tax unrealized gain (loss)	$ 5,585		$ 3,701
Unrealized gains on investments	1,557	$ 229
Proceeds from sale of mutual funds and debt securities	4,025
Pre tax reclassification of net investment realized gain (loss) into net income	(229)	(152)
Reclassification of net investment realized gain (loss) into net income, net tax	(140)	(93)
Proceeds from sale of investments available for sale		$ 1,062
HealthCare Partners (HCP)
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Required minimum cash balance	61,567
Certificates of deposit, commercial paper and money market funds due within one year
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax	2,113
Unrealized gains on investments	$ 1,559

Cash deposited in a reserve account to comply with regulatory requirements.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities, net of securities sold in current quarter.

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Amount before tax of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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The cash inflow associated with the sale of debt securities classified as available-for-sale securities.

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