Related Party Transactions - Additional Information (Detail) - USD ($)	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Rental income from related party	$ 16,308,000	$ 32,667,000	$ 0
Tenant reimbursements from related party	1,406,000	2,842,000	0
Account receivable due from related party for tenant reimbursement	0	2,275,000
Net contribution from (distribution to) Ensign	0	4,356,000	(22,502,000)
Allocation Of Corporate Expenses [Member] \| Affiliated Entity [Member]
Related Party Transaction [Line Items]
Allocations of expenses for general and administrative services	0	7,400,000	5,400,000
Rental Income From Affiliate [Member] \| Director [Member]
Related Party Transaction [Line Items]
Rental income from related party	16,300,000	32,700,000
Tenant reimbursements from related party	$ 1,400,000	2,800,000
Account receivable due from related party for tenant reimbursement		2,300,000
Centralized Cash Management System [Member] \| Affiliated Entity [Member]
Related Party Transaction [Line Items]
Net contribution from (distribution to) Ensign		$ 4,400,000	$ (22,500,000)

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- Definition

For an unclassified balance sheet, amount of receivables arising from transactions with related parties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
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-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

Repayment received or receivable for expenses incurred on behalf of a client or customer, other than those reimbursements received by landlords from tenants.

+ References

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- Definition

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No definition available.

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- Definition

Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party.

+ References

No definition available.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
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-Section S99
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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