The number of general partner units outstanding.

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Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

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The number of limited partner units issued.

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The number of limited partner units outstanding.

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Total change in each class of partners' capital accounts during the year due to redemptions and adjustments to redemption value. All partners include general, limited and preferred partners.

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The number of units redeemed during the year of each class of partners' capital account. Units represent shares of ownership of the general, limited, and preferred partners.

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Business Combination, Consideration Transferred, Stock Conversion Ratio, Per Acquiree Share

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Unit conversion factor for common stock assigned at the time of the merger.

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ACCOUNTING POLICIES (Details) (USD $)	3 Months Ended	0 Months Ended	1 Months Ended
ACCOUNTING POLICIES (Details) (USD $)	Mar. 31, 2015	Jan. 16, 2015	Apr. 24, 2015	Dec. 31, 2014
Redeemable Noncontrolling Interest [Line Items]
Fair value of operating partnership units exceeding cost	248,100,000			$ 159,100,000
NHPPMBLP
Redeemable Noncontrolling Interest [Line Items]
Unit conversion factor for common stock	0.7866
NHPPMBLP \| Limited Partner
Redeemable Noncontrolling Interest [Line Items]
Limited partnership units, outstanding (in shares)	2,812,402
Percentage of ownership interest on total units outstanding	29.40%
NHPPMBLP \| General Partner
Redeemable Noncontrolling Interest [Line Items]
Percentage of ownership interest on total units outstanding	70.60%
Limited partnership units outstanding (in shares)	6,762,711
American Realty Capital Healthcare Trust
Redeemable Noncontrolling Interest [Line Items]
Limited partnership units, outstanding (in shares)		7,057,271
Business combination, consideration transferred, stock conversion ratio, per acquiree share		0.1688
American Realty Capital Healthcare Trust \| General Partner
Redeemable Noncontrolling Interest [Line Items]
Limited partnership units, issued (in shares)		7,057,271
Ventas Realty OP \| Limited Partner
Redeemable Noncontrolling Interest [Line Items]
Percentage of ownership interest on total units outstanding	3.70%
Ventas Realty OP \| Limited Partner \| Class C Units
Redeemable Noncontrolling Interest [Line Items]
Limited partnership units, outstanding (in shares)	1,118,525
Ventas Realty OP \| Limited Partner \| Class C Units \| Subsequent Event
Redeemable Noncontrolling Interest [Line Items]
Partners' capital account, units, redeemed			445,541
Partners' capital account, redemptions			$ 32,600,000
Ventas Realty OP \| General Partner
Redeemable Noncontrolling Interest [Line Items]
Percentage of ownership interest on total units outstanding	96.30%
Ventas Realty OP \| General Partner \| Class C Units
Redeemable Noncontrolling Interest [Line Items]
Limited partnership units outstanding (in shares)	28,550,812
Ventas Realty OP \| General Partner \| Ventas Realty OP Units
Redeemable Noncontrolling Interest [Line Items]
Limited partnership units outstanding (in shares)	176,374