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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Income Tax [Line Items]      
Effective Income Tax rate Reconciliation, Percent 10.60% 14.10%  
Valuation Allowances and Reserves, Deductions $ 75.0 $ 19.4  
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations $ 42.0 $ 33.8  
Deferred tax expense overstated amount     $ 18.0
Tools [Member]      
Income Tax [Line Items]      
Deferred Tax Liabilities, Tax Deferred Income     $ 164.0