Business and Basis of Presentation - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue recognized previously attributable to deferred revenues	$ 650,100	$ 605,500
Acquisition and integration charges	2,772	59,266
Business exit costs		41,600
Loss from divested operations	2,075	0
Cash and cash equivalents and restricted cash, beginning of period	149,270	$ 227,630
Cash and cash equivalents	149,270			$ 156,368
Restricted cash				2,300
Operating leases - right-of-use assets	634,142		$ 651,900
Lease liabilities	836,451		851,300
Total Assets	6,714,675			6,201,474
Total Liabilities	$ 5,857,778			$ 5,350,717
United States
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Percentage of lease payments	87.00%
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Assets			638,700
Total Liabilities			$ 638,700