Income taxes.

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Minimum distribution percentage of taxable income to qualify for real estate investment trust.

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- Definition

Tax cuts and jobs act of 2017 enacted date.

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Tax cuts and jobs act of 2017 one time transition tax.

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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Amount recognized for uncertainty in income taxes classified as current.

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Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2018
Income Taxes [Line Items]
Minimum Distribution Percentage of Taxable Income to Qualify for Real Estate Investment Trust				90.00%
TCJA enacted date				Dec. 22, 2017
U.S. federal corporate tax rate				21.00%		35.00%
TCJA one time transition tax				$ 0
Effect of change in income tax associated with the ACT		$ 1,000,000.0	$ 4,500,000
Income tax expense	$ 1,486,000	$ 2,842,000		5,942,000	$ 7,205,000
Liabilities for uncertain tax positions	$ 0			$ 0			$ 0