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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
Mar. 31, 2020
Mar. 31, 2019
Accumulated Other Comprehensive Income Loss [Line Items]    
Beginning Balance $ 430,215 $ 409,762
Other comprehensive income before reclassification 1,830 5,981
Amounts reclassified from accumulated other comprehensive income (346) 11
Change in deferred tax valuation allowance   (198)
Net current period other comprehensive income 1,484 5,794
Ending Balance 436,956 430,405
Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Beginning Balance 12,211 (832)
Ending Balance $ 13,695 $ 4,962