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Other Comprehensive Income (Loss) - Reclassifications Adjustment for Gains (Losses) Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses) on investments	$ (1,605)		$ 145		$ (13,130)	$ (2,496)
Income taxes	(13,637)		(15,164)		(27,233)	(26,808)
NET INCOME	37,293	$ 40,148	46,084	$ 40,055	77,441	86,139
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] | Amount Reclassified from Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses) on investments	(36)		(32)		109	(2,797)
Income taxes	10		11		(27)	681
NET INCOME	$ (26)		$ (21)		$ 82	$ (2,116)

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Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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