Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands			12 Months Ended
		Aug. 09, 2017	Dec. 31, 2018		Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Deferred payments of previous acquisitions	[1]		$ 20,843		$ 705,257	$ 1,331,985
Investments in other businesses			17,000		39,000
Payments on seller notes payable	[1]		498,305		423,156	118,500
Issuance of new debt in acquisition	[1]		0		29,341	$ 0
Equity method investments			42,674	[2]	32,859
2018 Acquisitions
Business Acquisition [Line Items]
Aggregate purchase price			21,200
Cash acquired			11,000
Acquisitions Prior to 2018
Business Acquisition [Line Items]
Deferred payments of previous acquisitions			3,800
Payments on seller notes payable			1,600
2017 Acquisitions
Business Acquisition [Line Items]
Aggregate purchase price			725,100
Cash acquired			96,300
Issuance of new debt in acquisition			$ 29,300
Cambridge
Business Acquisition [Line Items]
Aggregate purchase price		$ 616,000
Cash acquired		94,500
Issuance of new debt in acquisition		23,800
Creative Lodging Solutions
Business Acquisition [Line Items]
Aggregate purchase price					109,100
Cash acquired					1,800
Issuance of new debt in acquisition					5,500
Other intangible assets					53,459
Non-compete agreements | Cambridge
Business Acquisition [Line Items]
Other intangible assets		$ 5,800
Non-compete agreements | Creative Lodging Solutions
Business Acquisition [Line Items]
Other intangible assets					$ 3,900

[1] Reflects the impact of the Company's adoption of Accounting Standards Update 2016-18, Statement of Cash Flows (Topic 230), which was adopted by the Company on January 1, 2018 and applied retrospectively to results for 2017. The adoption of Topic 230 resulted in the statement of cash flows presenting the changes in the total of cash, cash equivalents and restricted cash. As a result, the Company will no longer present transfers between cash and cash equivalents and restricted cash in the statement of cash flows.

[2] Reflects the impact of the Company's adoption of ASC 606 and related cost capitalization guidance, which was adopted by the Company on January 1, 2018 using the modified retrospective transition method. The adoption of ASC 606 resulted in an adjustment to retained earnings in our consolidated balance sheet for the cumulative effect of applying the standard, which included costs incurred to obtain a contract, as well as presentation changes in our statements of income, including the classification of certain amounts previously classified as merchant commissions and processing expense net with revenues. As a result of the application of the modified retrospective transition method, the Company's prior period results within its Form 10-K and quarterly reports on Form 10-Q will not be restated to reflect ASC 606.