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Changes in Level 3 Investments Measured at Fair Value on Recurring Basis (Detail) - Other Invested Assets - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 31,176	$ 15,034	$ 33,663	$ 3,489
Included in accumulated other comprehensive income (loss)	23	(404)	481	(834)
Equity in Limited Partnership	106		1,448
Purchases	2,250	6,500	2,250	18,475
Distributions		(12)	(4,287)	(12)
Ending balance	$ 33,555	$ 21,118	$ 33,555	$ 21,118

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