Commitments and Contingencies (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) ft² lease_arrangement	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Number Of Lease Arrangements | lease_arrangement	8
Operating lease rent expense | $	$ 1,006	$ 1,166	$ 1,041
Equipment Construction Contracts | Performance Guarantee
Other commitment | $	3,314
Equipment Construction Contracts | Surety Bond
Other commitment | $	$ 4,598
Gallarate, Italy | Office Building
Area of property (in square feet)	1,300
Westlake, Ohio | Office Building
Area of property (in square feet)	5,000
Aurora Illinois | Office Building
Area of property (in square feet)	11,000
Durham, North Carolina | Office Building
Area of property (in square feet)	2,590
Beijing, China | Office Building
Area of property (in square feet)	8,000
Stamford, Connecticut | Office Building
Area of property (in square feet)	6,440
Overland Park | Office Building
Area of property (in square feet)	600