Acquisitions - Summary of Final Estimated Fair Value of Intangible Assets Acquired and the Related Estimated Useful Lives (Detail) - USD ($) $ in Thousands		12 Months Ended
	Aug. 09, 2017	Dec. 31, 2018	Dec. 31, 2017
Trade names and trademarks—other
Business Acquisition [Line Items]
Useful lives (in years)		13 years 9 months 18 days
Non-compete agreements
Business Acquisition [Line Items]
Useful lives (in years)		4 years 2 months 12 days
Cambridge
Business Acquisition [Line Items]
Customer relationships and other identifiable intangible assets	$ 271,793
Cambridge | Trade names and trademarks—indefinite lived
Business Acquisition [Line Items]
Trade names and trademarks	$ 35,110
Cambridge | Banking relationships
Business Acquisition [Line Items]
Useful lives (in years)	20 years
Other intangible assets	$ 705
Cambridge | Customer Relationships
Business Acquisition [Line Items]
Customer relationships and other identifiable intangible assets	$ 178,190
Cambridge | Customer Relationships | Minimum
Business Acquisition [Line Items]
Useful lives (in years)	7 years
Cambridge | Customer Relationships | Maximum
Business Acquisition [Line Items]
Useful lives (in years)	18 years
Cambridge | Customer relationships - Accounts Payable Solutions
Business Acquisition [Line Items]
Useful lives (in years)	20 years
Customer relationships and other identifiable intangible assets	$ 41,749
Cambridge | Non-compete agreements
Business Acquisition [Line Items]
Other intangible assets	$ 5,800
Cambridge | Technology
Business Acquisition [Line Items]
Useful lives (in years)	5 years
Customer relationships and other identifiable intangible assets	$ 16,039
Creative Lodging Solutions
Business Acquisition [Line Items]
Other intangible assets			$ 53,459
Creative Lodging Solutions | Trade names and trademarks—other
Business Acquisition [Line Items]
Useful lives (in years)			1 year
Other intangible assets			$ 180
Creative Lodging Solutions | Customer Relationships
Business Acquisition [Line Items]
Other intangible assets			$ 51,529
Creative Lodging Solutions | Customer Relationships | Minimum
Business Acquisition [Line Items]
Useful lives (in years)			8 years
Creative Lodging Solutions | Customer Relationships | Maximum
Business Acquisition [Line Items]
Useful lives (in years)			10 years
Creative Lodging Solutions | Customer relationships - Accounts Payable Solutions
Business Acquisition [Line Items]
Other intangible assets			$ 53,459
Creative Lodging Solutions | Non-compete agreements
Business Acquisition [Line Items]
Other intangible assets			$ 3,900
Creative Lodging Solutions | Technology
Business Acquisition [Line Items]
Useful lives (in years)			4 years
Other intangible assets			$ 1,750