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Comprehensive Income and Accumulated Other Comprehensive Income - Schedule of Changes in Accumulated Other Comprehensive Income (AOCI) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 436,956	$ 430,405	$ 430,215	$ 409,762
Other comprehensive income before reclassification	5,588	5,001	7,373	10,889
Amounts reclassified from accumulated other comprehensive income	(105)	(21)	(406)	83
Change in deferred tax valuation allowance		198
Net current period other comprehensive income	5,483	5,178	6,967	10,972
Ending Balance	462,796	449,443	462,796	449,443
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	13,695	4,962	12,211	(832)
Ending Balance	$ 19,178	$ 10,140	$ 19,178	$ 10,140

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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