Commitments and Contingencies - Additional Information (Detail) $ in Millions		9 Months Ended
	Sep. 19, 2016 USD ($) Installment	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Leases [Abstract]
Expiration of non-cancellable operating leases		Through 2022
Accrued lease commitments expense		$ 3.4
Estimated sublease income		2.1
Funds to be repaid under the agreement	$ 0.3	$ 0.3	$ 0.3
Amount received to start-up new facility	$ 1.0
Interest rate of funds under the agreement	0.00%
Number of equal quarterly installments | Installment	20