Business Combinations - Components of Identifiable Intangible Assets and Estimated Useful Lives (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($)
Finite-Lived Intangible Assets [Line Items]
Total intangible assets subject to amortization	$ 47,200
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	13 years
Total intangible assets subject to amortization	$ 42,600
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	5 years
Total intangible assets subject to amortization	$ 3,700
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	6 years
Total intangible assets subject to amortization	$ 900