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Beginning Balance, Annual Activity and Ending Balance of Accumulated Other Comprehensive Income Loss (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Balance $ 274,834 $ 271,534 $ 268,326       $ 268,326  
Other comprehensive gain (loss) (436) (537) 85 $ (897)     (888) $ (1,468)
Balance 278,261 274,834 271,534       278,261  
Accumulated Other Comprehensive Income (Loss)                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Balance (3,993) (3,456) (3,541) (2,541) $ (2,218) $ (1,970) (3,541) (1,970)
Other comprehensive gain (loss) (436) (537) 85 (897) (323) (248)    
Balance $ (4,429) $ (3,993) $ (3,456) $ (3,438) $ (2,541) $ (2,218) $ (4,429) $ (3,438)