Acquisition - Additional Information (Details) - USD ($) $ in Thousands			6 Months Ended				12 Months Ended
		Aug. 09, 2017	Jun. 30, 2018		Jun. 30, 2017		Dec. 31, 2017
Business Acquisition [Line Items]
Investments in other businesses			$ 11,192	[1]	$ 6,327	[1]	$ 39,000
Deferred payments for acquisitions in previous years	[1]		3,811		$ 3,580
Acquisitions Prior to 2018
Business Acquisition [Line Items]
Deferred payments for acquisitions in previous years			$ 3,800
2017 Acquisitions
Business Acquisition [Line Items]
Aggregate purchase price							725,100
Cash acquired from acquisition							96,300
Note payable incurred							29,300
Cambridge
Business Acquisition [Line Items]
Aggregate purchase price		$ 616,000
Cash acquired from acquisition		94,500
Note payable incurred		23,800
Creative Lodging Solutions
Business Acquisition [Line Items]
Aggregate purchase price							109,100
Cash acquired from acquisition							1,800
Note payable incurred							5,500
Non-compete agreements | Cambridge
Business Acquisition [Line Items]
Noncompete agreements		$ 5,800
Non-compete agreements | Creative Lodging Solutions
Business Acquisition [Line Items]
Noncompete agreements							$ 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.