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Comprehensive Income and Accumulated Other Comprehensive Income - Schedule of Changes in Accumulated Other Comprehensive Income (AOCI) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance $ 409,762 $ 425,423 $ 456,150
Net current period other comprehensive income (loss) 13,043 (4,243) 4,104
Ending Balance 430,215 409,762 425,423
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance (832) 3,612 (492)
Adjusted beginning balance (832) 3,411 (492)
Other comprehensive income (loss) before reclassification 12,379 (4,551) 4,823
Amounts reclassified from accumulated other comprehensive income (loss) 664 308 (719)
Net current period other comprehensive income (loss) 13,043 (4,243) 4,104
Ending Balance $ 12,211 (832) $ 3,612
Accumulated Other Comprehensive Income (Loss) [Member] | ASU 2016-01 [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Impact of adoption of ASU   (615)  
Accumulated Other Comprehensive Income (Loss) [Member] | ASU 2018-02 [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Impact of adoption of ASU   $ 414