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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Commitments And Contingencies Disclosure [Abstract]        
Operating Leases, Future Minimum Payments Due $ 25.5   $ 25.5  
Operating Leases, Future Minimum Payments Due, Remainder of fiscal year 2.4   2.4  
Operating Leases, Future Minimum Payments, Due in Two Years 4.3   4.3  
Operating Leases, Future Minimum Payments, Due in Three Years 4.1   4.1  
Operating Leases, Future Minimum Payments, Due in Four Years 3.9   3.9  
Operating Leases, Future Minimum Payments, Due Thereafter 10.8   10.8  
Operating Leases, Rent Expense $ 1.0 $ 0.4 $ 1.8 $ 0.6