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Business Overview and Summary of Significant Accounting Policies - Additional Information (Details) location in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) location | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Accounting Policies [Abstract] |  |  |
Approximate number of in-market locations | location | 3 |  |
Impairment of property and equipment long-lived assets | $ 0 | $ 0 | $ 0
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Excess tax benefits from stock-based compensation | 1,800,000 |  |
Reclassification offsetting cash flows used in financing activities | 407,200,000 | 346,800,000 | 340,900,000
Reclassification to cash flows provided by operating activities | $ 585,200,000 | 519,900,000 | 550,300,000
Accounting Standards Update 2016-09 [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Reclassification offsetting cash flows used in financing activities |  | 5,900,000 | 3,400,000
Reclassification to cash flows provided by operating activities |  | $ 5,900,000 | $ 3,400,000

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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3574-108585 + Details
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