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Acquisition - Additional Information (Detail) - CaseStack, Inc. [Member] - USD ($) $ in Thousands		1 Months Ended		3 Months Ended	9 Months Ended
	Dec. 03, 2018	Apr. 30, 2019	Dec. 31, 2018	Sep. 30, 2019	Sep. 30, 2019
Business Acquisition [Line Items]
Consideration for transaction	$ 252,858
Business acquisition, cash paid	249,389	$ 700	$ 248,700
Deferred purchase consideration	$ 3,469
Deferred purchase consideration payable term	24 months
Amortization expense of intangible assets				$ 2,300	$ 6,900
Intangible assets, weighted average useful life					9 years

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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