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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		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 29,992	$ 5,364	$ 33,663	$ 3,489
Included in accumulated other comprehensive income (loss)	95	(204)	458	(430)
Equity in Limited Partnership	1,089		1,342
Purchases		9,874		11,975
Distributions			(4,287)
Ending balance	$ 31,176	$ 15,034	$ 31,176	$ 15,034

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