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Goodwill and Intangible Assets - Intangible Assets (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	May. 30, 2014	Mar. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets		$ 5,110
Granville-Phillips [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	$ 38,850		$ 38,850
Completed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets		820
Completed Technology [Member] | Granville-Phillips [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets			15,700
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets		1,430
Customer Relationships [Member] | Granville-Phillips [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	$ 21,250		21,250
Patents, Trademarks, Trade Names and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets		$ 2,860
Patents, Trademarks, Trade Names and Other [Member] | Granville-Phillips [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets			$ 1,900

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