Commitments and Contingencies - Additional Information (Detail) $ in Thousands, € in Millions		12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 EUR (€)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2017 EUR (€)
Loss Contingencies [Line Items]
Rent expense		$ 13,200		$ 13,200	$ 12,900
Incentive awarded to the company by the State of Connecticut, total	$ 9,900					$ 11,500
Incentive awarded to the company by the State of Connecticut, non-interest bearing loans	7,500					8,000
Incentive awarded to the company by the State of Connecticut, grants	2,400					$ 3,500
Non-interest bearing incentive loan term		10 years	10 years
Forgiveness awarded to the company by the state of Connecticut	7,000
Incentive awarded to the company by the State of Connecticut, revenue recognized		$ 1,300		1,400	1,400
Incentive awarded to the company by the State of Connecticut, deferred revenue	4,400	4,400		4,800
Aggregate consideration payment for purchase of shares		62,887		$ 92,329	$ 215,405
Ackermans & van Haaren NV, Mr. Jozef Gielen and Kapimar Comm.V | Share Purchase Agreement
Loss Contingencies [Line Items]
Aggregate consideration payment for purchase of shares		42,000	€ 35
Termination fee payable	6,000	6,000					€ 5
Termination fee receivable	12,000	12,000					10
Additional reimbursement amount receivable	$ 6,000	$ 6,000					€ 5
Maximum
Loss Contingencies [Line Items]
Non-cancellable operating leases expiration year		2031	2031