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Goodwill and Intangible Assets - Intangible Assets (Parenthetical) (Detail) - USD ($) $ in Thousands			12 Months Ended
	Mar. 17, 2015	May. 30, 2014	Dec. 31, 2015	Dec. 31, 2014
Granville-Phillips [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets		$ 38,850		$ 38,850
Precisive, LLC [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	$ 5,110		$ 5,110
Completed Technology [Member] | Granville-Phillips [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets				15,700
Completed Technology [Member] | Precisive, LLC [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets			820
Customer Relationships [Member] | Granville-Phillips [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets		$ 21,250		21,250
Customer Relationships [Member] | Precisive, LLC [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	$ 1,430		1,430
Patents, Trademarks, Trade Names and Other [Member] | Granville-Phillips [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets				$ 1,900
Patents, Trademarks, Trade Names and Other [Member] | Precisive, LLC [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets			$ 2,860

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