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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Income Tax Contingency [Line Items]    
Company's total liability for uncertain tax positions $ 29.4 $ 25.9
Minimum [Member]    
Income Tax Contingency [Line Items]    
Decrease in uncertain tax position 15.0  
Uncertain tax positions recognized would favorably impact its effective tax rate 7.0  
Maximum [Member]    
Income Tax Contingency [Line Items]    
Decrease in uncertain tax position 18.0  
Uncertain tax positions recognized would favorably impact its effective tax rate $ 10.0