Acquisitions and Dispositions - Summary of Intangible Assets Acquired (Detail) (MEGTEC Holdings Inc [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, Amount	$ 42,000
Customer relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, Amount	20,000
Intangible assets, Amortization Period	7 years
Backlog [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, Amount	9,500
Intangible assets, Amortization Period	1 year
Trade names/trademarks [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, Amount	6,000
Intangible assets, Amortization Period	15 years
Developed technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, Amount	$ 6,500
Intangible assets, Amortization Period	10 years