Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2013 People	Sep. 26, 2011
Leases [Abstract]
Expiration of non-cancellable operating leases	Through 2022
Accrued lease commitments expense	$ 5.4
Estimated sublease income	2.8
Rent expense under operating leases	0.3	0.3
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
New deadline to meet employment commitment	Feb. 28, 2015