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Accumulated Other Comprehensive Loss - Activity within Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     $ 754,917  
Other comprehensive income (loss) $ (594) $ (2,228) 14,526 $ (4,887)
Ending balance 771,309   771,309  
Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     (94,100) (71,576)
Ending balance $ (79,574) $ (76,463) $ (79,574) $ (76,463)