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Noncash transactions - Additional Information (Detail) |  |  |  | 0 Months Ended |  |  | 0 Months Ended |  |  |  |  |
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Jun. 14, 2013 | Jun. 11, 2013 Alaska Joint Venture Acquisition [Member] Operating Partnership [Member] | Jun. 10, 2013 Series D Convertible Units [Member] Operating Partnership [Member] | Jun. 10, 2013 Series E Convertible Units [Member] Operating Partnership [Member] | Jun. 14, 2013 Class A Common Shares [Member] | Dec. 31, 2013 Class A Common Shares [Member] | Dec. 31, 2012 Class A Common Shares [Member] | Jun. 14, 2013 Class A Common Shares [Member] Operating Partnership [Member] | Jun. 11, 2013 Class A Common Shares [Member] Alaska Joint Venture Acquisition [Member] | Jun. 11, 2013 Class A Units [Member] Alaska Joint Venture Acquisition [Member] Operating Partnership [Member] | Feb. 28, 2013 Series C Convertible Units [Member] Operating Partnership [Member] | Dec. 31, 2013 Class B Common Shares [Member] | Feb. 28, 2013 Class B Common Shares [Member] | Dec. 31, 2012 Class B Common Shares [Member]
Nonmonetary Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Units outstanding |  |  |  |  |  |  |  |  |  |  | 31,085,974 |  |  |
Common shares issued |  |  |  |  |  | 184,869,219 | 38,663,998 |  |  |  |  | 635,075 | 634,408 | 667
Issuance of units |  | 12,395,965 | 4,375,000 | 4,375,000 |  |  |  |  |  | 12,395,965 |  |  |  |
Acquisition of Joint Venture |  |  |  |  |  |  |  |  | 43,609,394 |  |  |  |  |
Preferred units issued | 653,492 |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion to Class A units |  |  |  |  | 653,492 |  |  | 653,492 |  |  |  |  |  |
Additional units issued |  |  |  |  | 705,167 |  |  |  |  |  |  |  |  |

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- Definition Acquisition Of Shares In Joint Ventures + References No definition available. + Details
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- Definition Additional Preferred Units Issued + References No definition available. + Details
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- Definition Conversion Of Preferred Units + References No definition available. + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Number of common units issued of limited liability company (LLC). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055 + Details
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- Definition The number of limited partner units issued. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section F + Details
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- Definition The number of preferred units issued. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section F + Details
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