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Accumulated Other Comprehensive Loss - Activity within Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     $ 754,917  
Other comprehensive income $ 9,069 $ (8,774) 15,120 $ (2,659)
Ending balance 757,900   757,900  
Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     (94,100)  
Other comprehensive income     15,120  
Ending balance $ (78,980)   $ (78,980)