Acquisitions - Summary of Final Estimated Fair Value of Intangible Assets Acquired and the Related Estimated Useful Lives (Detail) - USD ($) $ in Thousands			12 Months Ended
	Nov. 30, 2020	Apr. 01, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 18, 2019
Trade Names and Trademarks
Business Acquisition [Line Items]
Useful lives (in years)			11 years 7 months 6 days
NvoicePay
Business Acquisition [Line Items]
Total intangibles		$ 44,750
NvoicePay | Trade Names and Trademarks
Business Acquisition [Line Items]
Trade names and trademarks		$ 8,700
NvoicePay | Proprietary Technology
Business Acquisition [Line Items]
Useful lives (in years)		6 years
Other intangible assets		$ 15,600
NvoicePay | Referral Partners
Business Acquisition [Line Items]
Useful lives (in years)		10 years
Other intangible assets		$ 810
NvoicePay | Supplier Network
Business Acquisition [Line Items]
Useful lives (in years)		10 years
Other intangible assets		$ 2,640
NvoicePay | Customer Relationships
Business Acquisition [Line Items]
Useful lives (in years)		16 years
Other intangible assets		$ 17,000
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Total intangibles	$ 40,850			$ 80,726	$ 40,850
Series of Individually Immaterial Business Acquisitions | Trade Names and Trademarks
Business Acquisition [Line Items]
Useful lives (in years)				2 years
Trade names and trademarks				$ 9,928
Series of Individually Immaterial Business Acquisitions | Trade Names and Trademarks
Business Acquisition [Line Items]
Useful lives (in years)	5 years
Trade names and trademarks	$ 1,800
Series of Individually Immaterial Business Acquisitions | Licensed Software and Technology
Business Acquisition [Line Items]
Useful lives (in years)	10 years
Other intangible assets	$ 4,400
Series of Individually Immaterial Business Acquisitions | Proprietary Technology
Business Acquisition [Line Items]
Useful lives (in years)	5 years
Other intangible assets	$ 8,400
Series of Individually Immaterial Business Acquisitions | Referral Partners
Business Acquisition [Line Items]
Useful lives (in years)				20 years
Other intangible assets				$ 2,200
Series of Individually Immaterial Business Acquisitions | Supplier Network
Business Acquisition [Line Items]
Useful lives (in years)	10 years
Other intangible assets	$ 300
Series of Individually Immaterial Business Acquisitions | Customer Relationships
Business Acquisition [Line Items]
Useful lives (in years)	16 years
Other intangible assets	$ 25,950			54,288
Series of Individually Immaterial Business Acquisitions | Technology Equipment [Member]
Business Acquisition [Line Items]
Other intangible assets				$ 14,010
Series of Individually Immaterial Business Acquisitions | Technology Equipment [Member] | Minimum
Business Acquisition [Line Items]
Useful lives (in years)				5 years
Series of Individually Immaterial Business Acquisitions | Technology Equipment [Member] | Maximum
Business Acquisition [Line Items]
Useful lives (in years)				10 years
Series of Individually Immaterial Business Acquisitions | Lodging [Member]
Business Acquisition [Line Items]
Useful lives (in years)				10 years
Other intangible assets				$ 300