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Investments in Debt and Equity Securities - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Available for sale investments gross pre-tax unrealized gain (loss)	$ 6,783		$ 6,783		$ 3,701
Unrealized gains on investments	1,057	$ 638	2,614	$ 867
Proceeds from sale of mutual funds and debt securities			5,049
Pre tax reclassification of net investment realized gain (loss) into net income			(346)	(152)
Reclassification of net investment realized gain (loss) into net income, net tax			(211)	(93)
Proceeds from sale of investments available for sale				$ 1,347
HealthCare Partners (HCP)
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Required minimum cash balance	$ 56,717		56,717
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			3,428
Unrealized gains on investments			$ 2,616