Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2015
Finite Lived Intangible Assets [Line Items]
Gross Value	$ 121,885	$ 108,055
Accumulated Amortization	(53,756)	(59,594)
Total other intangible assets Net	68,129	48,461
Customer relationships
Finite Lived Intangible Assets [Line Items]
Gross Value	77,026	68,296
Technology
Finite Lived Intangible Assets [Line Items]
Gross Value	32,467	$ 29,473
Global Thermoelectric Inc
Finite Lived Intangible Assets [Line Items]
Gross Value	9,406
Accumulated Amortization	(1,465)
Total other intangible assets Net	7,941
Global Thermoelectric Inc | Customer relationships
Finite Lived Intangible Assets [Line Items]
Gross Value	5,264
Accumulated Amortization	(334)
Total other intangible assets Net	$ 4,930
Estimated useful life of intangible assets	12 years
Global Thermoelectric Inc | Order backlog
Finite Lived Intangible Assets [Line Items]
Gross Value	$ 777
Accumulated Amortization	$ (777)
Estimated useful life of intangible assets	6 months
Global Thermoelectric Inc | Technology
Finite Lived Intangible Assets [Line Items]
Gross Value	$ 2,675
Accumulated Amortization	(204)
Total other intangible assets Net	$ 2,471
Estimated useful life of intangible assets	10 years
Global Thermoelectric Inc | Trade Name
Finite Lived Intangible Assets [Line Items]
Gross Value	$ 690
Accumulated Amortization	(150)
Total other intangible assets Net	$ 540
Estimated useful life of intangible assets	3 years 6 months