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New Accounting Pronouncements - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accounting Changes and Error Corrections [Abstract]    
Income tax benefit related to the settlement of share-based awards during period $ 4,900  
Share-based payments reclassified from operating activity to financing activity $ 16,192 $ 6,072