Commitments and Contingencies (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2009	Dec. 31, 2013 Equipment Construction Contracts	Dec. 31, 2009 Annual Minimum	Dec. 31, 2009 Annual Maximum	Dec. 31, 2009 Total Minimum	Dec. 31, 2009 Total Maximum	Dec. 31, 2013 Office Building Stamford, Connecticut sqft	Dec. 31, 2013 Office Building Beijing, China sqft	Dec. 31, 2013 Office Building Durham, North Carolina sqft	Dec. 31, 2013 Office Building Gallarate, Italy sqft	Dec. 31, 2009 Annual Amount Based On The Achievement Of A Minimum Annual Gross Margin Dollar Level (the Hurdle) Advanced Combustion Technology, Inc. (ACT)	Dec. 31, 2009 Minimum Annual Gross Margin Dollar Level (the Hurdle) For Fiscal 2009 Advanced Combustion Technology, Inc. (ACT)	Dec. 31, 2010 Minimum Annual Gross Margin Dollar Level (the Hurdle) For Fiscal 2010 Advanced Combustion Technology, Inc. (ACT)	Dec. 31, 2011 Minimum Annual Gross Margin Dollar Level (the Hurdle) For Fiscal 2011 Advanced Combustion Technology, Inc. (ACT)
Operating Leases, Rent Expense	$ 1,010,000	$ 964,000	$ 879,000
Area of Real Estate Property (in square feet)										6,440	5,800	16,000	1,300
Other Commitment					4,124,000
Business Acquisition, Contingent Consideration, Potential Cash Payment						0	4,000,000	0	12,000,000					4,000,000
Business Acquisition, Contingent Consideration, Trigger															10,000,000	11,000,000	12,000,000
Loss Contingency, Estimate of Possible Loss				2,307,000
Gain on revaluation of ACT liability	0	0	758,000
Loss Contingency Accrual, at Carrying Value		$ 0