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Basis of Presentation and Summary of Significant Accounting Policies - Gross Billings Based on Billing Address of Clients or Client Affiliates (Detail) - Accounting Standards Update 2014-09 - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation Of Revenue [Line Items]
Gross Billings	$ 568,744	$ 396,504	$ 1,524,697	$ 989,843
US
Disaggregation Of Revenue [Line Items]
Gross Billings	479,489	337,134	1,282,178	843,557
International
Disaggregation Of Revenue [Line Items]
Gross Billings	$ 89,255	$ 59,370	$ 242,519	$ 146,286

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Disclosure of gross transaction volume for revenues which are reported net.

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Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790

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