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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (loss) Pre-Tax and After-Tax (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
After-tax:
Other comprehensive income (loss)	[1]	$ 11,984	$ (4,050)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
OCI, Pre-tax:
Pre-tax, Unrealized holding gains (losses) arising during the period		16,045	(8,034)
Pre-tax, Less: Reclassification adjustments (gains) losses realized in net income		(145)	2,765
Pre-tax, Other comprehensive income (loss)		15,900	(5,269)
OCI, Tax:
Tax, Unrealized holding gains (losses) arising during the period		3,953	(1,889)
Tax, Less: Reclassification adjustments (gains) losses realized in net income		(37)	670
Tax, Other comprehensive income (loss)		3,916	(1,219)
After-tax:
After-tax, Unrealized holding gains (losses) arising during the period		12,092	(6,145)
After-tax, Less: Reclassification adjustments (gains) losses realized in net income		(108)	2,095
Other comprehensive income (loss)		$ 11,984	$ (4,050)
[1] Represents change in fair value of available-for-sale investments, net of income tax provision of $3,916 thousand for the three months ended March 31, 2019 and a change in fair value of available-for-sale investments, net of income tax benefit of $1,219 thousand for the three months ended March 31, 2018.

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