Acquisitions - Narrative (Detail) - USD ($) $ in Thousands			3 Months Ended	12 Months Ended
	Nov. 16, 2015	May 29, 2015	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Cash to acquire business				$ 7,400
Purchase price in cash				9,394	$ 339,961	$ 3,242
New World Systems Corporation
Business Acquisition [Line Items]
Cash acquired from acquisition	$ 22,500
Purchase price in cash	$ 337,500
Accrued purchase price				4,000
Number of common stock shares valued at acquisition	2,100,000
Common stock value at acquisition date	$ 362,800
Fees incurred in acquisition	$ 5,900		$ 5,900
Payment for previous acquisition				2,000
Goodwill, purchase price adjustments				$ (7,372)
Brazos Technology Corporation
Business Acquisition [Line Items]
Cash acquired from acquisition		$ 312
Purchase price in cash		$ 6,100
Number of common stock shares valued at acquisition		12,500
Common stock value at acquisition date		$ 1,500
Debt assumed from business acquisition		$ 733