Summary of Total Purchase Price Allocated to Net Assets Acquired (Detail) - CaseStack, Inc. [Member] - USD ($) $ in Thousands		1 Months Ended
	Dec. 03, 2018	Apr. 30, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Cash paid	$ 249,389	$ 700	$ 248,700
Deferred purchase consideration	3,469
Total consideration	$ 252,858