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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