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Related party transactions - Additional Information 1 (Detail) (USD $) | 6 Months Ended | 12 Months Ended | 0 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2013 | Dec. 31, 2012 | Feb. 28, 2013 2,770 Property Contribution [Member] | Dec. 31, 2011 2,770 Property Contribution [Member] 2012 Offering [Member] | Dec. 31, 2013 2,770 Property Contribution [Member] 2012 Offering [Member] | Dec. 31, 2012 2,770 Property Contribution [Member] 2012 Offering [Member] | Dec. 31, 2013 MMI [Member]
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Compensation and benefit costs, net |  |  |  |  |  |  |  | $ 17,023,000
General and administrative expenses | $ 47,000 | $ 8,845,000 | $ 7,199,000 | $ 7,989,000 | $ 47,000 | $ 993,000 | $ 6,949,000 |

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- Definition The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The aggregate amount of expenditures for salaries, wages, profit sharing and incentive compensation, and other employee benefits, including equity-based compensation, and pension and other postretirement benefit expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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Balance Type: | debit
Period Type: | duration

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- Details
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