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Shareholders' equity - Additional Information 1 (Detail) (Operating Partnership [Member], USD $)	12 Months Ended
	Dec. 31, 2013
Series D Convertible Units [Member]
Class of Stock [Line Items]
Units outstanding	4,375,000
Stock split conversion ratio	1
Closing price per share	$ 18.00
Series D Convertible Units [Member] | Scenario One, Over Four Consecutive Quarters [Member]
Class of Stock [Line Items]
Adjusted funds from operations per common share	$ 0.80
Series D Convertible Units [Member] | Scenario Two, Two Consecutive Quarters [Member]
Class of Stock [Line Items]
Units distribution percentage	70.00%
Series E Convertible Units [Member]
Class of Stock [Line Items]
Units outstanding	4,375,000
Stock split conversion ratio	1
Annualized EBITDA Contribution	$ 14,000,000
Series E Convertible Units [Member] | Scenario Three, Measurement Period [Member]
Class of Stock [Line Items]
EBITDA contribution	28,000,000
Series C Convertible Units [Member]
Class of Stock [Line Items]
Percentage of Property Contribution	3.90%
Percentage of scheduled rents	98.00%
Property Contributions price per unit	$ 15.50
Units outstanding	31,085,974
Dividend payable, amount	$ 4,698,000

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Adjusted Funds from Operations per Common Share

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- Definition

Annualized Earnings Before Interest Tax Depreciation and Amortization Contribution

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Common Stock Per Unit

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- Definition

EBITDA Contribution

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- Definition

Percentage Of Property Contribution Per Unit To Maximum

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Percentage Of Property Lease To Scheduled Rents

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Preferred Distributions Percentage

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- Definition

Purchase Price Per Unit

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Number of common units of ownership outstanding of a limited liability company (LLC).

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Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Current Liabilities

-URI http://asc.fasb.org/extlink&oid=6509677



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.20)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Stock Split

-URI http://asc.fasb.org/extlink&oid=6525746



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 4

-Subparagraph (SAB TOPIC 4.C)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770

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