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Commitments and Contingencies - Additional Information (Detail) (Brazil [Member], USD $)
In Millions, unless otherwise specified
1 Months Ended 9 Months Ended
Dec. 31, 2010
Mar. 31, 2010
Sep. 30, 2014
Brazil [Member]
     
Commitments And Contingencies [Line Items]      
Tax assessment settled with payments $ 3.9 $ 12.2  
Amount of interest, penalties and monetary restatement fees on tax assessments 7.8    
Tax credits once certified, period to use credits     5 years
Value of assessments served on Brazilian subsidiary $ 13.0