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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 1 Months Ended
Jun. 30, 2013
ATP [Member]
Jun. 30, 2013
ATP [Member]
Sep. 30, 2013
ATP [Member]
Dec. 31, 2012
ATP [Member]
Dec. 31, 2010
BRAZIL
Mar. 31, 2010
BRAZIL
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  
Value of assessments served on Brazilian subsidiary         13.0  
Receivables from bankruptcy     0.4 1.4    
Pre-tax loss recognized 0.7          
Deferred revenues   $ 3.7