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Noncash transactions - Additional Information (Detail)
 0 Months Ended 0 Months Ended
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