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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		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 462,796	$ 449,443	$ 430,215	$ 409,762
Other comprehensive income before reclassification	1,316	2,467	8,317	12,844
Amounts reclassified from accumulated other comprehensive income	(582)	8	(616)	603
Net current period other comprehensive income	734	2,475	7,701	13,447
Ending Balance	481,910	468,729	481,910	468,729
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	19,178	10,140	12,211	(832)
Ending Balance	$ 19,912	$ 12,615	$ 19,912	$ 12,615

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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