Acquisitions - Summary of Fair Values of Assets Acquired and Consideration Paid (Detail) - USD ($) $ in Thousands		12 Months Ended
Jul. 31, 2020	Dec. 31, 2020	Dec. 31, 2018
Fair Value of Consideration Transferred
Cash paid or payable	$ 7,200	$ 18,000	$ 44,294
Contingent consideration	375	$ 375	$ 25,491
Total fair value of consideration transferred	7,575
Total fair value of assets acquired	7,575
Assigned Useful Life		9 years
Customer Relationships [Member]
Fair Value of Consideration Transferred
Finite lived intangible assets, net acquired	$ 7,340
Assigned Useful Life	5 years	7 years
Assembled Workforce [Member]
Fair Value of Consideration Transferred
Finite lived intangible assets, net acquired	$ 235
Assigned Useful Life	5 years

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 amount, measured at acquisition-date fair value, of all liabilities assumed that arise from contingencies and were recognized by the entity.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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