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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance $ 453,981 $ 446,968 $ 416,814
Net current period other comprehensive income (loss) (3,079) (223) 7,105
Ending Balance 456,150 453,981 446,968
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance 2,587 2,810 (4,295)
Other comprehensive income (loss) before reclassification (3,231) (1,584) 6,558
Amounts reclassified from accumulated other comprehensive income 152 1,361 547
Net current period other comprehensive income (loss) (3,079) (223) 7,105
Ending Balance $ (492) $ 2,587 $ 2,810