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Commitments and Contingencies - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Commitments And Contingencies Disclosure [Abstract]        
Rent expense incurred but not paid $ 3.1 $ 2.7 $ 8.7 $ 7.2