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Shareholders' equity - Additional Information 2 (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Jun. 14, 2013
Dec. 31, 2013
Consolidated Subsidiaries [Member]
Dec. 31, 2013
2012 Equity Incentive Plan [Member]
Dec. 31, 2012
2012 Equity Incentive Plan [Member]
Dec. 31, 2012
3.5% Convertible Perpetual Preferred Units [Member]
Operating Partnership [Member]
Jun. 14, 2013
3.5% Convertible Perpetual Preferred 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]
Dec. 31, 2013
Class A Common Shares [Member]
2012 Equity Incentive Plan [Member]
Dec. 31, 2012
Class A Common Shares [Member]
2012 Equity Incentive Plan [Member]
Dec. 31, 2013
Class A Common Shares [Member]
Equity Option [Member]
2012 Equity Incentive Plan [Member]
Dec. 31, 2012
Class A Common Shares [Member]
Equity Option [Member]
2012 Equity Incentive Plan [Member]
Dec. 31, 2013
Class A Common Shares [Member]
Equity Option [Member]
2012 Equity Incentive Plan [Member]
Board of Trustees [Member]
Dec. 31, 2013
Class A Common Shares [Member]
Subscription Agreement [Member]
Dec. 31, 2012
Class A Common Shares [Member]
Subscription Agreement [Member]
Option One [Member]
Jun. 14, 2013
Class A Common Shares [Member]
Operating Partnership [Member]
Feb. 28, 2014
Class A Common Shares [Member]
Subsequent Events [Member]
Feb. 28, 2014
Class A Common Shares [Member]
Subsequent Events [Member]
2012 Equity Incentive Plan [Member]
Apr. 30, 2013
Class A Common Shares [Member]
Maximum [Member]
2012 Equity Incentive Plan [Member]
Apr. 30, 2013
Class A Common Shares [Member]
Minimum [Member]
2012 Equity Incentive Plan [Member]
Dec. 31, 2013
Class A Units [Member]
Dec. 31, 2012
Class A Units [Member]
Dec. 31, 2013
Class A Units [Member]
Operating Partnership [Member]
Dec. 31, 2012
Class A Units [Member]
Operating Partnership [Member]
Dec. 31, 2013
Series C Convertible Units [Member]
Dec. 31, 2013
Series C Convertible Units [Member]
Operating Partnership [Member]
Dec. 31, 2013
Series D Convertible Units [Member]
Operating Partnership [Member]
Dec. 31, 2013
Preferred Units [Member]
Class of Stock [Line Items]                                                              
Preferred units issued     653,492       653,492                                                
Rate of Preferred units             3.50%                                                
Annual distribution             $ 0.525                                                
Preferred units outstanding               653,492                                              
Percentage of interest held                                               6.90% 0.10%            
Units outstanding                                                   199,291,586 38,697,333   31,085,974 4,375,000  
Preferred Units converted into Class A units                 653,492                   653,492                        
Noncontrolling interest $ 13,245     $ 58,000                                       $ 1,760,000       $ 14,906,000     $ 157,000
Issuance of common shares                                 434,783 3,333,334                          
Aggregate purchase price of shares                                   50,000                          
Purchase price per share                                 $ 17.25 $ 15.00                          
Issuance of shares under the plan                     650,000   1,500,000                 6,000,000 1,500,000                
Plan termination date         November 2022                                                    
Stock options granted           50,000       485,000                                          
Vesting period           4 years           4 years 4 years               4 years                    
Expiration period of options           10 years           10 years 10 years               10 years                    
Issuance of shares under the plan 550,000 700,000               550,000   485,000               940,000                      
Stock options cancelled 60,000                      60,000                                      
Stock Options, Exercised                         0                                      
Restricted stock units                                         92,000                    
Share-based compensation expense $ 1,079 $ 70                       $ 762 $ 70 $ 317                              
Common stock issued                       19,500