Commitments and Contingencies (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Leases, Rent Expense	$ 1,041	$ 1,010	$ 964
Equipment Construction Contracts | Performance Guarantee
Other Commitment	8,620
Equipment Construction Contracts | Surety Bond
Other Commitment	$ 12,389
Office Building | Stamford, Connecticut
Area of Real Estate Property (in square feet)	6,440
Office Building | Beijing, China
Area of Real Estate Property (in square feet)	8,000
Office Building | Durham, North Carolina
Area of Real Estate Property (in square feet)	16,000
Office Building | Gallarate, Italy
Area of Real Estate Property (in square feet)	1,300
Office Building | Westlake, Ohio
Area of Real Estate Property (in square feet)	5,000