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Related party transactions - Additional Information (Detail) (USD $) | 0 Months Ended | 12 Months Ended |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |  |  |  | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  |  | 1 Months Ended | 12 Months Ended
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Feb. 28, 2013 | Dec. 31, 2013 Property | Dec. 31, 2012 Property | Dec. 31, 2013 Class A Common Shares [Member] | Dec. 31, 2012 Class A Common Shares [Member] | Dec. 31, 2013 Class B Common Shares [Member] | Dec. 31, 2012 Class B Common Shares [Member] | Feb. 28, 2013 2,770 Property Contribution [Member] Property | Dec. 31, 2013 Sponsor [Member] | Dec. 31, 2012 Sponsor [Member] | Dec. 31, 2013 Sponsor [Member] Class A Common Shares [Member] | Dec. 31, 2012 Sponsor [Member] Class A Common Shares [Member] | Dec. 31, 2013 Sponsor [Member] Class B Common Shares [Member] | Dec. 31, 2012 Sponsor [Member] Class B Common Shares [Member] | Dec. 31, 2013 Sponsor [Member] Class A Units [Member] | Dec. 31, 2012 Sponsor [Member] Class A Units [Member] | Dec. 31, 2012 Sponsor [Member] 3.5% Convertible Perpetual Preferred Units [Member] | Dec. 31, 2013 Sponsor [Member] Series C Convertible Units [Member] | Dec. 31, 2013 Sponsor [Member] Series D Convertible Units [Member] | Dec. 31, 2013 Sponsor [Member] Series E Convertible Units [Member] | Dec. 31, 2013 Sponsor [Member] 2,770 Property Contribution [Member] Property | Dec. 31, 2012 Sponsor [Member] 2,770 Property Contribution [Member] Property | Dec. 31, 2011 Sponsor [Member] 2,770 Property Contribution [Member] Property | Dec. 31, 2013 Sponsor [Member] Agreement on Investment Opportunities [Member] | Dec. 31, 2012 Sponsor [Member] Agreement on Investment Opportunities [Member] | Nov. 30, 2012 Sponsor [Member] Agreement on Investment Opportunities [Member] | Nov. 30, 2012 Advisor [Member] | Dec. 31, 2013 Advisor [Member] | Dec. 31, 2012 Advisor [Member] | Feb. 28, 2013 Advisor [Member] 2,770 Property Contribution [Member] Property | Nov. 30, 2012 Property Manager [Member] | Dec. 31, 2013 Property Manager [Member] Deferred Costs and Other Intangibles [Member] | Dec. 31, 2012 Property Manager [Member] Deferred Costs and Other Intangibles [Member] | Dec. 31, 2013 Property Manager [Member] Operating Expenses [Member] | Dec. 31, 2012 Property Manager [Member] Operating Expenses [Member]
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares owned |  |  |  |  |  |  |  |  |  |  | 3.70% | 8.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares outstanding |  |  |  | 184,869,219 | 38,663,998 | 635,075 | 667 |  |  |  |  |  | 635,075 | 667 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Units outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,787,292 | 32,668 |  | 31,085,974 | 4,375,000 | 4,375,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred units outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 653,492 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest rate |  |  |  |  |  |  |  |  | 24.60% | 17.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivables from sponsor |  |  |  |  |  |  |  |  | $ 4,516,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advisory management fee in percent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.75% |  |  |  |  |  |  |  |
Permanent reduction in advisory management fee | 9,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,800,000 |  |  |  |  |  |  |  |
Number of properties |  | 23,268 | 3,644 |  |  |  |  | 2,770 |  |  |  |  |  |  |  |  |  |  |  |  | 109 | 2,628 | 33 |  |  |  |  |  |  | 2,770 |  |  |  |  |
Advisory fees |  | 6,352,000 | 937,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,352,000 |  |  |  |  |  |  |
Accrued management fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 937,000 |  |  |  |  |  |
Property management fee in percent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.00% |  |  |  |
Leasing fee description |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | One-half month of each lease's annual rent. |  |  |  |
Fees incurred to the Property Manager |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,888,000 | 55,000 | 1,264,000 | 12,000
Acquisition and renovation fee in percent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |
Monthly maintenance fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |
Acquisition and renovation fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 113,670,000 | 4,602,000 |  |  |  |  |  |  |  |  |  |
Asset acquisition cost |  |  | 455,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 108,871,000 | 4,188,000 |  |  |  |  |  |  |  |  |  |
Property acquisition cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,799,000 | 414,000 |  |  |  |  |  |  |  |  |  |
Accrued acquisition and renovation fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,560,000 | $ 2,811,000 |  |  |  |  |  |  |  |  |  |

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- Definition Percentage of fee paid to the Sponsor, in relation to acquisition and renovation services rendered to the Company. + References No definition available. + Details
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- Definition Amount expensed related to property acquisitions with in-place leases. + References No definition available. + Details
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- Definition The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=27015464&loc=d3e511914-122862 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph c -Subparagraph 3(ii)(A) -Article 4 + Details
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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 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 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition This element represents a description of the nature and extent of capital lease arrangements between related parties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6452652&loc=d3e36975-112693 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition Amount paid to managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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- Definition Receivables to be collected from (obligations owed to) related parties, net as of the balance sheet date where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Subparagraph 1 -Article 4 + Details
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- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28200181&loc=SL6759159-111685 + Details
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