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Related party transactions (Details) (USD $) | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |  |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2013 Sponsor | Sep. 30, 2013 Sponsor | Sep. 30, 2014 Sponsor | Dec. 31, 2013 Sponsor | Sep. 30, 2014 Sponsor Class A common shares | Dec. 31, 2013 Sponsor Class A common shares | Sep. 30, 2014 Sponsor Class B common shares | Dec. 31, 2013 Sponsor Class B common shares | Sep. 30, 2014 Sponsor Agreement on Investment Opportunities | Sep. 30, 2013 Sponsor Agreement on Investment Opportunities | Sep. 30, 2014 Sponsor Agreement on Investment Opportunities | Sep. 30, 2013 Sponsor Agreement on Investment Opportunities | Nov. 30, 2012 Sponsor Agreement on Investment Opportunities | Sep. 30, 2013 Advisor | Sep. 30, 2013 Advisor | Nov. 30, 2012 Property Manager | Sep. 30, 2013 Property Manager | Sep. 30, 2013 Property Manager | Sep. 30, 2014 MMI | Sep. 30, 2013 MMI | Sep. 30, 2014 MMI | Sep. 30, 2013 MMI | Sep. 30, 2014 Operating Partnership Sponsor Class A Units | Dec. 31, 2013 Operating Partnership Sponsor Class A Units | Sep. 30, 2014 Operating Partnership Sponsor Series C Convertible Units | Dec. 31, 2013 Operating Partnership Sponsor Series C Convertible Units | Sep. 30, 2014 Operating Partnership Sponsor Series D Convertible Units | Dec. 31, 2013 Operating Partnership Sponsor Series D Convertible Units | Sep. 30, 2014 Operating Partnership Sponsor Series E Convertible Units | Dec. 31, 2013 Operating Partnership Sponsor Series E Convertible Units
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest rate (as a percent) |  |  |  |  |  |  |  | 21.70% | 24.60% | 3.30% | 3.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.10% | 6.90% |  |  |  |  |  |
Shares owned |  |  |  |  |  |  |  |  |  |  |  | 635,075 | 635,075 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Units owned (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,787,292 | 13,787,292 | 31,085,974 | 31,085,974 | 4,375,000 | 4,375,000 | 4,375,000 | 4,375,000
Payable to sponsor | $ 10,170,000 |  | $ 10,170,000 |  | $ 0 |  |  | $ 10,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivable from sponsor |  |  |  |  |  |  |  |  | 4,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Administrative expenses paid to related party | 0 | 0 | 0 | 6,352,000 |  | 0 | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  | 0 | 6,400,000 |  |  |  | 11,200,000 | 7,200,000 | 30,300,000 | 8,400,000 |  |  |  |  |  |  |  |
Property management fee, percentage of collected rent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management fee, percentage of lease annual rent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees incurred to the Property Manager |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Acquisition and renovation fee in percent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Termination or other fees payable in connection with the termination of agreement to provide services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Monthly maintenance fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition and renovation fees |  |  |  |  |  |  |  |  |  |  |  |  |  | 31,800,000 | 22,900,000 | 58,600,000 | 95,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset acquisition cost |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,000,000 | 22,600,000 | 44,600,000 | 92,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property acquisition cost |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,800,000 | 300,000 | 14,000,000 | 2,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued acquisition and renovation fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued and unpaid reimbursable compensation and benefit costs | $ 300,000 |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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