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 People	Jun. 30, 2012	Sep. 26, 2011
Leases [Abstract]
Expiration of non-cancellable operating leases			through 2022
Rent expense under operating leases	$ 0.6	$ 0.6	$ 1.2	$ 1.4
Incentives per square feet			40.00
Incentives for improvements to space			2.2
Lease agreement term			10 years
Amount received to start-up new facility					$ 1.0
Minimum number of people to be employed			232
Time period to meet employment commitment			3 years