Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Jun. 30, 2019
Summary Of Significant Accounting Policies [Line Items]
Minimum percentage of distributed taxable income to qualify as REIT	90.00%
Percentage of non-deductible excise tax on distribution	4.00%
Percentage of ordinary income considered for payment of distribution	85.00%
Percentage of capital gain net income considered for payment of distribution	95.00%
Percentage of undistributed income of prior considered for payment of distribution	100.00%
Unrecognized tax benefit or expense, accrued interest or penalties	$ 0
Accounting Standards Update 2017-12
Summary Of Significant Accounting Policies [Line Items]
Increase to OCI due to reclassification adjustment from AOCI on derivatives	$ 1,400,000
Scenario Forecast
Summary Of Significant Accounting Policies [Line Items]
Threshold public float limit for transition period		$ 700,000,000
Minimum
Summary Of Significant Accounting Policies [Line Items]
Percentage of uncertain tax positions likelihood of being sustained	50.00%