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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Income Tax Examination [Line Items]          
Effective tax benefit rate 41.30% 187.90% 43.10% (280.50%)  
U.S. federal statutory rate 35.00% 35.00% 35.00% 35.00%  
Unrecognized tax benefits $ 1.8   $ 1.8   $ 1.9
Accrued interest payable for taxes 0.1   0.1   0.1
Liability for income tax penalties 0.0   0.0   $ 0.0
Foreign Tax Authority [Member]          
Income Tax Examination [Line Items]          
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability (14.3)   (14.3)    
State and Local Jurisdiction [Member]          
Income Tax Examination [Line Items]          
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability $ 12.8   $ 12.8