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Earnings per share - Computation of Net Loss per Share on Basic and Diluted Basis (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Dec. 31, 2012
Income / loss (numerator):                      
Loss from continuing operations                 $ (42) $ (20,074) $ (10,236)
Income from discontinued operations                   1,008  
Noncontrolling interest                   13,245  
Dividends on preferred shares                   1,160  
Conversion of preferred units                   10,456  
Net loss attributable to common shareholders $ (14,519) $ (7,659) $ (13,997) $ (7,752) $ (5,831) $ (2,675) $ (1,566) $ (164) $ (42) $ (43,927) $ (10,236)
Weighted-average shares (denominator):                      
Total weighted-average shares                 3,301,667 123,592,086 7,225,512
Net loss per share- basic and diluted:                      
Loss from continuing operations                 $ (0.01) $ (0.37) $ (1.42)
Income from discontinued operations                   $ 0.01  
Net loss per share- basic and diluted $ (0.08) $ (0.05) $ (0.15) $ (0.16) $ (0.09) $ (0.81) $ (0.47) $ (0.05) $ (0.01) $ (0.36) $ (1.42)
Formation Transaction [Member] | Class A Common Shares [Member]
                      
Weighted-average shares (denominator):                      
Total weighted-average shares                 3,301,000 3,301,000 3,301,000
Formation Transaction [Member] | Class B Common Shares [Member]
                      
Weighted-average shares (denominator):                      
Total weighted-average shares                 667 667 667
2012 Offering [Member] | Class A Common Shares [Member]
                      
Weighted-average shares (denominator):                      
Total weighted-average shares                   35,362,998 3,923,845
2013 Offering [Member] | Class A Common Shares [Member]
                      
Weighted-average shares (denominator):                      
Total weighted-average shares                   37,502,997  
2,770 Property Contribution [Member] | Class B Common Shares [Member]
                      
Weighted-average shares (denominator):                      
Total weighted-average shares                   533,598  
IPO [Member] | Class A Common Shares [Member]
                      
Weighted-average shares (denominator):                      
Total weighted-average shares                   17,888,799  
2013 Concurrent Private Placements [Member] | Class A Common Shares [Member]
                      
Weighted-average shares (denominator):                      
Total weighted-average shares                   1,900,685  
IPO Over-allotment Exercise [Member] | Class A Common Shares [Member]
                      
Weighted-average shares (denominator):                      
Total weighted-average shares                   2,411,362  
Alaska Joint Venture Acquisition [Member] | Class A Common Shares [Member]
                      
Weighted-average shares (denominator):                      
Total weighted-average shares                   24,373,470  
Subscription Agreement [Member] | Class A Common Shares [Member]
                      
Weighted-average shares (denominator):                      
Total weighted-average shares                   309,708  
Board of Trustees [Member] | Class A Common Shares [Member]
                      
Weighted-average shares (denominator):                      
Total weighted-average shares                   6,802