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Number of hotels in ownership by company.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Investment in Unconsolidated Entities - Additional Information (Details)				9 Months Ended
	Jun. 09, 2017 USD ($) option Hotel	May 09, 2017 USD ($) option Hotel	Dec. 30, 2015 USD ($) Hotel Room	Sep. 30, 2017	Dec. 31, 2017 USD ($) Hotel Room	Dec. 31, 2016 USD ($)	Nov. 17, 2014	Jun. 09, 2014	Jun. 08, 2014	Apr. 17, 2013 USD ($) Room
Schedule of Equity Method Investments [Line Items]
Aggregate number of rooms in hotels \| Room					6,018
Investment in unconsolidated real estate entities					$ 24,389,000	$ 20,424,000
Number of hotels in ownership by Company \| Hotel					40
Outstanding borrowing under the revolving credit facility					$ 32,000,000	52,500,000
Percentage of maximum amount of debt outstanding				15.00%
Percentage of outstanding debt balances				20.00%
BRE Torrance Holdco LLC \| Torrance Joint Venture
Schedule of Equity Method Investments [Line Items]
Proceeds from sale of equity method investments			$ 51,800,000
Realized gain (loss) on disposal			$ 3,600,000
Torrance Joint Venture \| Cerberus Capital Management
Schedule of Equity Method Investments [Line Items]
Indirect ownership in the leased, hotels			5.00%							5.00%
Investment in joint venture										$ 31,000,000
Aggregate number of rooms in hotels \| Room			248							248
Torrance Joint Venture \| Cerberus Capital Management \| Senior Secured Revolving Credit Facility
Schedule of Equity Method Investments [Line Items]
Investment in joint venture										$ 1,600,000
Torrance Joint Venture \| BRE Torrance Holdco LLC
Schedule of Equity Method Investments [Line Items]
Aggregate number of rooms in hotels \| Room			248
Innkeepers Joint Venture
Schedule of Equity Method Investments [Line Items]
Aggregate number of rooms in hotels \| Room					6,097
Innkeepers Joint Venture \| Cerberus Capital Management
Schedule of Equity Method Investments [Line Items]
Indirect ownership in the leased, hotels									10.30%
NewINK Joint Venture
Schedule of Equity Method Investments [Line Items]
Indirect ownership in the leased, hotels			10.30%		10.30%			10.30%
Investment in joint venture					$ (6,600,000)
Percentage ownership by third party (in percentage)								89.70%
Investment in unconsolidated real estate entities					51,800,000	10,100,000
Difference between carrying amount and share of partners' capital					$ 58,400,000	16,100,000
Number of hotels in ownership by Company \| Hotel			47		47
Inland Joint Venture
Schedule of Equity Method Investments [Line Items]
Indirect ownership in the leased, hotels			10.00%		10.00%		10.00%
Investment in joint venture					$ 24,400,000
Aggregate number of rooms in hotels \| Room					6,401
Percentage ownership by third party (in percentage)							90.00%
Investment in unconsolidated real estate entities					$ 35,500,000	20,400,000
Difference between carrying amount and share of partners' capital					$ 11,100,000	$ 0
Number of hotels in ownership by Company \| Hotel					48
Senior Notes \| NewINK Joint Venture
Schedule of Equity Method Investments [Line Items]
Loan amount refinanced		$ 840,000,000.0
Number of hotels in ownership by Company \| Hotel		47
Outstanding borrowing under the revolving credit facility		$ 850,000,000
Senior Notes \| Inland Joint Venture
Schedule of Equity Method Investments [Line Items]
Loan amount refinanced	$ 817,000,000.0
Number of hotels in ownership by Company \| Hotel	48
Outstanding borrowing under the revolving credit facility	$ 780,000,000
Additional borrowing capacity	$ 5,000,000
LIBOR \| Senior Notes \| NewINK Joint Venture
Schedule of Equity Method Investments [Line Items]
Debt instrument, basis spread on variable rate		2.79%
Number of extension options \| option		3
Period of extension options		1 year
LIBOR \| Senior Notes \| Inland Joint Venture
Schedule of Equity Method Investments [Line Items]
Debt instrument, basis spread on variable rate	3.30%
Number of extension options \| option	3
Period of extension options		1 year