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Comprehensive Income and Accumulated Other Comprehensive Income - Reclassification Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net realized losses on investments	$ (4)	$ (329)	$ (27)	$ (1,471)
Income before income taxes	26,613	24,460	72,591	64,804
Income tax expense	(5,227)	(4,759)	(13,915)	(11,978)
Net income	21,386	19,701	58,676	52,826
Unrealized Losses on Available-for-Sale Securities [Member] | Reclassification Out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net realized losses on investments	(10)	(32)	(764)	(445)
Income before income taxes	(10)	(32)	(764)	(445)
Income tax expense	2	7	161	40
Net income	$ (8)	$ (25)	$ (603)	$ (405)

X

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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