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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, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

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

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Investments in Debt and Equity Securities and Other Investments - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Available for sale investments gross pre-tax unrealized gain (loss)	$ 2,779		$ 2,589
Unrealized gain (losses) on investments, net of tax	229	$ 382
Proceeds from sale of investments available for sale	1,062	1,217
Pre tax reclassification of net investment realized gain (loss) into net income	152	257
Reclassification of net investment realized gain (loss) into net income, net of tax	93	$ 157
HealthCare Partners (HCP)
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Required minimum cash balance	58,567
Preferred Stock
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Preferred stock, in a privately held company	6,250
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	342
Unrealized gain (losses) on investments, net of tax	$ 229