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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Income Tax Disclosure [Abstract]          
Earnings of foreign entities $ 15.2 $ 16.4 $ 40.6 $ 44.0  
Effective tax rate, percentage (193.00%) 40.00% 49.00% 17.00%  
Increase (decrease) in valuation allowance of deferred tax assets   $ 4.7   $ (5.4)  
Unrecognized tax benefit for uncertain tax positions $ 25.6   $ 25.6   $ 24.3
Accrued interest and penalties related to income tax liabilities 1.5   1.5   $ 1.9
Decrease in unrecognized tax benefits due to expiration of statutes of limitations and settlement of various audits $ 1.4   $ 1.4