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Distributions - Summary of Distributions Paid Including Activity in Plan as well as Limited Partnership Units Issued from Reinvestment of Unit Distributions (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
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Oct. 31, 2018 | Jul. 31, 2018 | Apr. 30, 2018 | Jan. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2016 | Jan. 31, 2016 | Jan. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stockholders |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,402 | $ 12,375 | $ 12,375
Common Stockholders |  |  |  |  |  |  |  |  |  |  |  |  | 46,306 | 44,576 | 39,472
Limited Partnership Unitholders |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,981 | $ 15,268 | $ 13,533
Common Stock Shares Issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 572,928 | 266,011 | 186,797
Limited Partnership Units Issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 107,433 | 111,351 | 124,758
October 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stockholders | $ 2,953 |  |  |  | $ 3,094 |  |  | $ 3,094 |  |  |  |  |  |  |
Common Stockholders | 11,706 |  |  |  | 11,221 |  |  | 10,168 |  |  |  |  |  |  |
Limited Partnership Unitholders | $ 4,062 |  |  |  | $ 3,838 |  |  | $ 3,478 |  |  |  |  |  |  |
Common Stock Shares Issued (in shares) | 216,476 |  |  |  | 82,991 |  |  | 44,176 |  |  |  |  |  |  |
Discounted Share Price (in usd per share) | $ 49.34 |  |  |  | $ 59.33 |  |  | $ 57.18 |  |  |  |  |  |  |
Limited Partnership Units Issued (in shares) | 13,867 |  |  |  | 15,596 |  |  | 30,891 |  |  |  |  |  |  |
Average Unit Price (in usd per share) | $ 50.20 |  |  |  | $ 60.08 |  |  | $ 57.18 |  |  |  |  |  |  |
July 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stockholders |  | $ 2,953 |  |  |  | $ 3,094 |  |  | $ 3,094 |  |  |  |  |  |
Common Stockholders |  | 11,590 |  |  |  | 11,160 |  |  | 10,133 |  |  |  |  |  |
Limited Partnership Unitholders |  | $ 4,055 |  |  |  | $ 3,830 |  |  | $ 3,465 |  |  |  |  |  |
Common Stock Shares Issued (in shares) |  | 201,500 |  |  |  | 85,731 |  |  | 39,487 |  |  |  |  |  |
Discounted Share Price (in usd per share) |  | $ 51.68 |  |  |  | $ 57.40 |  |  | $ 65.64 |  |  |  |  |  |
Limited Partnership Units Issued (in shares) |  | 13,107 |  |  |  | 16,021 |  |  | 26,897 |  |  |  |  |  |
Average Unit Price (in usd per share) |  | $ 52.60 |  |  |  | $ 58.13 |  |  | $ 65.64 |  |  |  |  |  |
April 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stockholders |  |  | $ 2,672 |  |  |  | $ 3,094 |  |  | $ 3,094 |  |  |  |  |
Common Stockholders |  |  | 11,545 |  |  |  | 11,119 |  |  | 10,029 |  |  |  |  |
Limited Partnership Unitholders |  |  | $ 3,942 |  |  |  | $ 3,810 |  |  | $ 3,449 |  |  |  |  |
Common Stock Shares Issued (in shares) |  |  | 85,202 |  |  |  | 51,003 |  |  | 48,854 |  |  |  |  |
Discounted Share Price (in usd per share) |  |  | $ 47.54 |  |  |  | $ 59.64 |  |  | $ 51.59 |  |  |  |  |
Limited Partnership Units Issued (in shares) |  |  | 42,422 |  |  |  | 40,623 |  |  | 34,201 |  |  |  |  |
Average Unit Price (in usd per share) |  |  | $ 47.83 |  |  |  | $ 59.96 |  |  | $ 51.59 |  |  |  |  |
January 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stockholders |  |  |  | $ 3,824 |  |  |  |  |  |  | $ 3,093 | $ 3,093 |  |  |
Common Stockholders |  |  |  | 11,465 |  |  |  |  |  |  | 9,142 | 11,076 |  |  |
Limited Partnership Unitholders |  |  |  | $ 3,922 |  |  |  |  |  |  | $ 3,141 | $ 3,790 |  |  |
Common Stock Shares Issued (in shares) |  |  |  | 69,750 |  |  |  |  |  |  | 54,280 | 46,286 |  |  |
Discounted Share Price (in usd per share) |  |  |  | $ 52.71 |  |  |  |  |  |  | $ 49.24 | $ 61.85 |  |  |
Limited Partnership Units Issued (in shares) |  |  |  | 38,037 |  |  |  |  |  |  | 32,769 | 39,111 |  |  |
Average Unit Price (in usd per share) |  |  |  | $ 53.03 |  |  |  |  |  |  | $ 49.24 | $ 62.15 |  |  |

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