Future Gross Minimum Rent Payments due to Company under Existing Franchise Arrangements (Detail) $ in Millions	Dec. 31, 2017 USD ($)
Leases Disclosure [Line Items]
2018	$ 2,893.5
2019	2,813.2
2020	2,706.6
2021	2,577.4
2022	2,440.9
Thereafter	20,329.7
Total minimum payments	33,761.3
Owned sites
Leases Disclosure [Line Items]
2018	1,420.1
2019	1,389.9
2020	1,353.8
2021	1,306.1
2022	1,253.9
Thereafter	10,841.3
Total minimum payments	17,565.1
Leased sites
Leases Disclosure [Line Items]
2018	1,473.4
2019	1,423.3
2020	1,352.8
2021	1,271.3
2022	1,187.0
Thereafter	9,488.4
Total minimum payments	$ 16,196.2

Leases Disclosure [Line Items]

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- Definition

Future minimum rental payments in aggregate as of the balance sheet date under operating leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84164653&loc=d3e41551-112718

+ Details

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- Definition

Future rental payments receivable within one year of the balance sheet date under an operating lease.

+ References

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- Definition

Future rental payments receivable within the fifth year from the balance sheet date under an operating lease.

+ References

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- Definition

Future rental payments receivable within the fourth year from the balance sheet date under an operating lease.

+ References

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- Definition

Future rental payments receivable within the third year from the balance sheet date under an operating lease.

+ References

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- Definition

Future rental payments receivable within the second year from the balance sheet date under an operating lease.

+ References

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- Definition

Future minimum lease payments receivable under operating leases for periods greater than five years following the balance sheet date.

+ References

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