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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance $ 447,626 $ 436,956 $ 438,816 $ 430,215
Other comprehensive income (loss) before reclassification 2,139 5,588 (2,596) 7,373
Amounts reclassified from accumulated other comprehensive income (1,248) (105) (1,561) (406)
Net current period other comprehensive income (loss) 891 5,483 (4,157) 6,967
Ending Balance 468,366 462,796 468,366 462,796
Accumulated Other Comprehensive Income (Loss) [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance 15,971 13,695 21,019 12,211
Ending Balance $ 16,862 $ 19,178 $ 16,862 $ 19,178