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Organization and operations - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 3 Months Ended 1 Months Ended
Dec. 31, 2013
State
Property
Dec. 31, 2012
Property
Dec. 31, 2012
2012 Offering [Member]
Property
Dec. 31, 2012
2012 Offering [Member]
Property
Mar. 31, 2013
2013 Offering [Member]
Dec. 31, 2013
2013 Offering [Member]
Aug. 31, 2013
IPO [Member]
Aug. 31, 2013
2013 Concurrent Private Placements [Member]
Dec. 31, 2013
Series A and Series B Preferred Shares [Member]
Dec. 31, 2013
Series A Preferred Shares [Member]
Oct. 31, 2013
Series A Preferred Shares [Member]
Dec. 31, 2013
Series B Preferred Shares [Member]
Jun. 10, 2013
Operating Partnership [Member]
Series D Convertible Units [Member]
Jun. 10, 2013
Operating Partnership [Member]
Series E Convertible Units [Member]
Dec. 31, 2012
Sponsor [Member]
2012 Offering [Member]
Schedule Of Description Of Business [Line Items]                              
Number of properties 23,268 3,644 367 367                      
Number of states 22                            
Proceeds from offering before fees     $ 530,413,000   $ 747,500,000   $ 811,764,000 $ 75,000,000 $ 226,500,000           $ 5,307,000
Fees associated with the sale of stock 13,904,000   40,928,000 40,928,000 44,003,000 85,984,000 41,981,000                
Offering costs                 $ 13,904,000   $ 7,319,000 $ 6,585,000      
Sale of stock, number of shares issued                   5,060,000   4,000,000      
Preferred Shares dividend rate 5.00%                 5.00%   5.00%      
Issuance of units                         4,375,000 4,375,000