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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2012
Lawsuits
Commitments And Contingencies Disclosure [Abstract]          
Rent expense $ 1.0 $ 0.7 $ 3.3 $ 1.4  
Number of lawsuits         2