Acquisitions - Allocation of Purchase Price to Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 01, 2016	Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
Purchase Price Allocation, Goodwill	$ 344,369		$ 338,793
Rialco Limited [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Purchase Price Allocation, Goodwill		$ 1,426
Purchase Price Allocation, assets Net		5,603
Net tangible assets		5,177
Total purchase price		10,780
Customer Relationships [Member] | Rialco Limited [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	5 years
Purchase Price Allocation, intangible assets		2,512
Existing Technology [Member] | Rialco Limited [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	5 years
Purchase Price Allocation, intangible assets		846
Trade Names [Member] | Rialco Limited [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	4 years
Purchase Price Allocation, intangible assets		763
Backlog [Member] | Rialco Limited [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	less than one year
Purchase Price Allocation, intangible assets		$ 56