Goodwill and Acquired Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Jun. 30, 2016	May 05, 2016	Dec. 31, 2015
Finite Lived Intangible Assets [Line Items]
Gross carrying amount of intangible assets	$ 294,610		$ 294,610				$ 246,586
Intangible assets amortization expense	5,400	$ 4,700	16,100	$ 13,500
LABite
Finite Lived Intangible Assets [Line Items]
Acquired other intangible assets	48,684		48,684
Developed technology
Finite Lived Intangible Assets [Line Items]
Gross carrying amount of intangible assets	10,640		10,640				$ 9,819
Developed technology | LABite
Finite Lived Intangible Assets [Line Items]
Acquired other intangible assets	$ 1,731		$ 1,731			$ 1,731
Developed technology | Fully amortized assets
Finite Lived Intangible Assets [Line Items]
Gross carrying amount of intangible assets					$ 900