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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 |

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