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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
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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 |

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