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The number of limited partner units outstanding.

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Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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No definition available.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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No definition available.

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Amount of operating lease expense. Excludes sublease income.

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The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

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The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position.

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Basis of Presentation, Consolidation, Investments in Joint Ventures, and Noncontrolling Interests - Additional Information (Details) $ in Thousands	1 Months Ended	3 Months Ended	6 Months Ended		9 Months Ended
	Feb. 28, 2018 USD ($)	Sep. 30, 2019 USD ($) joint_venture shares	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) joint_venture shares	Dec. 31, 2018 shares
Noncontrolling Interest [Line Items]
Incremental expense		$ 400			$ 1,400
Variable interest entity, number of entities \| joint_venture		2			2
Variable interest entity, consolidated, carrying amount, liabilities		$ 56,000			$ 56,000
Variable interest entity, consolidated, carrying amount, assets		$ 114,200			$ 114,200
Limited partners' capital account, units outstanding (in shares) \| shares		2,110,037			2,110,037	2,035,349
Accounting Standards Update 2016-02
Noncontrolling Interest [Line Items]
Incremental expense		$ 1,300			$ 3,900
Redeemable Noncontrolling Interests
Noncontrolling Interest [Line Items]
Noncontrolling interest, decrease from redemptions or purchase of interests	$ 22,000		$ 0	$ 22,461
Operating Partnership
Noncontrolling Interest [Line Items]
Noncontrolling interest, ownership percentage by parent (as percent)		97.50%			97.50%	97.60%
Noncontrolling interest, ownership percentage by noncontrolling owners (as percent)		2.50%			2.50%	2.40%