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Commitments and Contingencies (Details) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2018 USD ($) property	Dec. 31, 2017 USD ($) property
Purchase Commitment [Line Items]
Single-family properties sales in escrow | property	155	69
Single-family properties sales in escrow, selling price	$ 23.9	$ 7.0
Silver Bay Realty Trust Corp.
Gain (Loss) on Sale of Securities, Net [Abstract]
Gain (loss) on sale of equity investments		3.0
Single Family Properties
Purchase Commitment [Line Items]
Purchase price of commitment to acquire single-family properties	48.3	128.1
Land
Purchase Commitment [Line Items]
Purchase price of commitment to acquire single-family properties	$ 67.3	$ 24.0
Commitment To Acquire Properties
Purchase Commitment [Line Items]
Number of properties | property	196	520

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- Definition

Expected Proceeds from Sale of Property Held-for-sale

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- Definition

Number of Real Estate Properties Held-for-Sale in Escrow

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X

- Definition

The difference between the carrying value and the sale price of equity securities, not separately or otherwise categorized as trading or available-for-sale. This element includes investments in which the entity holds a small ownership stake (generally, less than 20% of the shares outstanding) and cannot exert significant influence.

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- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

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No definition available.

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- Definition

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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- Definition

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

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