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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
	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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Acquisition And Renovation Fee.

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Percentage of fee paid to the Sponsor, in relation to acquisition and renovation services rendered to the Company.

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Amount of expenses related to the Advisor for designing and implementing the business strategy and administering the business activities and day-to-day operations of the reporting entity.

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The monthly payment which the related party must make under the terms of the agreement for the maintenance and use of certain intellectual property.

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The number of shares owned by the noncontrolling interest, a related party.

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The number of units of the operating partnership owned by the noncontrolling interest, a related party.

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The amount paid to a related party for property management services, as a percentage of collected rents.

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The amount paid to a related party for property management services, as a percentage of each lease's annual rent.

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Amount of termination or other fees payable in connection with the termination of agreement to provide services.

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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.

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For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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Carrying amount as of the balance sheet date of obligations due all related parties.

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Amount of expenses related to the managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP).

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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