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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Income Tax [Line Items]      
Effective Income Tax rate Reconciliation, Percent 18.80% 20.60%  
Valuation Allowances and Reserves, Deductions $ 35.2 $ 19.4  
Deferred tax expense overstated amount     $ 18.0
Tools [Member]      
Income Tax [Line Items]      
Deferred Tax Liabilities, Tax Deferred Income     $ 164.0