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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance     $ 425,423  
Ending Balance $ 458,996   458,996  
Accumulated Other Comprehensive Income (Loss) [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance (2,083) $ 2,416 3,612 $ (492)
Other comprehensive income (loss) before reclassification (2,143) 820 (7,964) 4,032
Amounts reclassified from accumulated other comprehensive income 25 (203) 151 (507)
Net current period other comprehensive income (loss) (2,118) 617 (7,813) 3,525
Ending Balance $ (4,201) $ 3,033 $ (4,201) $ 3,033