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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 |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2016 | Jan. 31, 2016 | Oct. 31, 2015 | Jul. 31, 2015 | Apr. 30, 2015 | Jan. 31, 2015 | Oct. 31, 2014 | Jul. 31, 2014 | Apr. 30, 2014 | Jan. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stockholders |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,375 | $ 12,375 | $ 13,474
Common Stockholders |  |  |  |  |  |  |  |  |  |  |  |  | 39,472 | 35,645 | 32,346
Limited Partnership Unitholders |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,533 | $ 12,228 | $ 11,117
Common Stock Shares Issued |  |  |  |  |  |  |  |  |  |  |  |  | 186,797 | 201,212 | 197,638
Limited Partnership Units Issued |  |  |  |  |  |  |  |  |  |  |  |  | 124,758 | 107,037 | 196,183
October 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stockholders | $ 3,094 |  |  |  | $ 3,094 |  |  |  | $ 3,856 |  |  |  |  |  |
Common Stockholders | 10,168 |  |  |  | 9,106 |  |  |  | 8,348 |  |  |  |  |  |
Limited Partnership Unitholders | $ 3,478 |  |  |  | $ 3,129 |  |  |  | $ 2,879 |  |  |  |  |  |
Common Stock Shares Issued | 44,176 |  |  |  | 47,313 |  |  |  | 40,142 |  |  |  |  |  |
Discounted Share Price | $ 57.18 |  |  |  | $ 55.73 |  |  |  | $ 52.71 |  |  |  |  |  |
Limited Partnership Units Issued | 30,891 |  |  |  | 28,936 |  |  |  |  |  |  |  |  |  |
Average Unit Price | $ 57.18 |  |  |  | $ 55.73 |  |  |  |  |  |  |  |  |  |
July 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stockholders |  | $ 3,094 |  |  |  | $ 3,094 |  |  |  | $ 3,206 |  |  |  |  |
Common Stockholders |  | 10,133 |  |  |  | 9,081 |  |  |  | 8,314 |  |  |  |  |
Limited Partnership Unitholders |  | $ 3,465 |  |  |  | $ 3,115 |  |  |  | $ 2,879 |  |  |  |  |
Common Stock Shares Issued |  | 39,487 |  |  |  | 56,003 |  |  |  | 57,696 |  |  |  |  |
Discounted Share Price |  | $ 65.64 |  |  |  | $ 50.30 |  |  |  | $ 46.79 |  |  |  |  |
Limited Partnership Units Issued |  | 26,897 |  |  |  | 32,041 |  |  |  |  |  |  |  |  |
Average Unit Price |  | $ 65.64 |  |  |  | $ 50.30 |  |  |  |  |  |  |  |  |
April 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stockholders |  |  | $ 3,094 |  |  |  | $ 3,094 |  |  |  | $ 3,206 |  |  |  |
Common Stockholders |  |  | 10,029 |  |  |  | 9,055 |  |  |  | 8,269 |  |  |  |
Limited Partnership Unitholders |  |  | $ 3,449 |  |  |  | $ 3,104 |  |  |  | $ 2,838 |  |  |  |
Common Stock Shares Issued |  |  | 48,854 |  |  |  | 54,921 |  |  |  | 60,212 |  |  |  |
Discounted Share Price |  |  | $ 51.59 |  |  |  | $ 50.21 |  |  |  | $ 44.14 |  |  |  |
Limited Partnership Units Issued |  |  | 34,201 |  |  |  | 25,264 |  |  |  | 104,831 |  |  |  |
Average Unit Price |  |  | $ 51.59 |  |  |  | $ 50.21 |  |  |  | $ 44.77 |  |  |  |
January 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stockholders |  |  |  | $ 3,093 |  |  |  | $ 3,093 |  |  |  | $ 3,206 |  |  |
Common Stockholders |  |  |  | 9,142 |  |  |  | 8,403 |  |  |  | 7,415 |  |  |
Limited Partnership Unitholders |  |  |  | $ 3,141 |  |  |  | $ 2,880 |  |  |  | $ 2,521 |  |  |
Common Stock Shares Issued |  |  |  | 54,280 |  |  |  | 42,975 |  |  |  | 39,588 |  |  |
Discounted Share Price |  |  |  | $ 49.24 |  |  |  | $ 56.74 |  |  |  | $ 45.15 |  |  |
Limited Partnership Units Issued |  |  |  | 32,769 |  |  |  | 20,796 |  |  |  | 91,352 |  |  |
Average Unit Price |  |  |  | $ 49.24 |  |  |  | $ 56.74 |  |  |  | $ 45.80 |  |  |

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