Schedule of Estimated Future Amortization Expense (Detail) $ in Thousands	Sep. 30, 2017 USD ($)	[1]
Goodwill And Intangible Assets Disclosure [Abstract]
2017 (remaining)	$ 2,771
2018	8,223
2019	7,561
2020	7,387
2021	6,773
Thereafter	8,473
Finite-Lived Intangible Assets, Net	$ 41,188

[1] Actual amortization expense to be reported in future periods could differ from these estimates as a result of new intangible asset acquisitions, changes in useful lives or other relevant factors or changes.