Investments In Real Estate - Additional Information (Detail) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2018 USD ($) Hotel	Sep. 30, 2017 USD ($) Hotel	Sep. 30, 2018 USD ($) Hotel	Sep. 30, 2017 USD ($) Hotel
Real Estate Properties [Line Items]
Number of hotels sold \| Hotel	1	1	2	4
Proceeds from sale of hotel	$ 2.0	$ 6.0	$ 6.0	$ 28.0
Gain (loss) on sale of hotels	(0.4)	1.0	0.1	1.0
Service [Member]
Real Estate Properties [Line Items]
Depreciation expense	$ 39.0	$ 36.0	$ 115.0	$ 104.0

Number of hotels sold.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant.

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The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

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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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