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Subsequent Events (Details) ft² in Millions		3 Months Ended
	Jan. 17, 2018 agreement	Dec. 31, 2017 ft² property state
ILPT
Subsequent Event [Line Items]
Number of properties | property		266
Number of states properties located in | state		25
Area of properties (in sqft) | ft²		28.5
ILPT | IPO | SIR | Subsequent event
Subsequent Event [Line Items]
Ownership percentage after IPO	69.20%
ILPT | RMR LLC | Subsequent event
Subsequent Event [Line Items]
Number of management agreements entered into | agreement	2

X

- Definition

Number Of Management Agreements

+ References

No definition available.

+ Details

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X

- Definition

Number Of States Real Estate Property Located In

+ References

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+ Details

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X

- Definition

Area of a real estate property.

+ References

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- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

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- Definition

Percentage of subsidiary's or equity investee's stock owned by parent company after stock transaction.

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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