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Recently Issued Accounting Standards - Additional Information (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Employee withholding taxes reclassified into financing activities $ 9.8 $ 13.8
ASU No. 2016-09 | Adjustments for New Accounting Principle, Early Adoption | Restatement Adjustment    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Employee withholding taxes reclassified from operating activities (9.8) (13.8)
Employee withholding taxes reclassified into financing activities $ 9.8 $ 13.8