Summary of Significant Accounting Policies (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Treasury yield term		10 years
Percentage points used in calculation for additional rent		6.00%
Non-normal tenant improvements	$ 138,900,000	$ 138,900,000
Effective tax rate	2.60%	2.30%
Tenant
Summary Of Significant Accounting Policies [Line Items]
Initial cap of non-normal tenant improvements in the first year		$ 100,000,000
Annual increase in non-normal tenant improvements		75,000,000
MGP Operating Partnership | Variable Interest Entity
Summary Of Significant Accounting Policies [Line Items]
Maximum exposure to loss, assets	$ 9,900,000,000	9,900,000,000
Maximum exposure to loss, liabilities	$ 227,000,000	$ 227,000,000