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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, 2015 | Jul. 31, 2015 | Apr. 30, 2015 | Jan. 31, 2015 | Oct. 31, 2014 | Jul. 31, 2014 | Apr. 30, 2014 | Jan. 31, 2014 | Oct. 31, 2013 | Apr. 30, 2013 | Jan. 31, 2013 | Jul. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stockholders |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,375 | $ 13,474 | $ 14,561
Common Stockholders |  |  |  |  |  |  |  |  |  |  |  |  | 35,645 | 32,346 | 29,205
Limited Partnership Unitholders |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,228 | $ 11,117 | $ 9,956
Dividend Reinvestments, Common Stock Issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 201,212 | 197,638 | 475,162
Dividend Reinvestments, Limited Partnership Units Issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 107,037 | 196,183 | 88,309
October 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stockholders | $ 3,094 |  |  |  | $ 3,856 |  |  |  | $ 3,206 |  |  |  |  |  |
Common Stockholders | 9,106 |  |  |  | 8,348 |  |  |  | 7,388 |  |  |  |  |  |
Limited Partnership Unitholders | $ 3,129 |  |  |  | $ 2,879 |  |  |  | $ 2,489 |  |  |  |  |  |
Dividend Reinvestments, Common Stock Issued (in shares) | 47,313 |  |  |  | 40,142 |  |  |  | 48,836 |  |  |  |  |  |
Dividend Reinvestments, Discounted Share Price (in usd per share) | $ 55.73 |  |  |  | $ 52.71 |  |  |  | $ 46.27 |  |  |  |  |  |
Dividend Reinvestments, Limited Partnership Units Issued (in shares) | 28,936 |  |  |  |  |  |  |  | 88,309 |  |  |  |  |  |
Dividend Reinvestments, Average Unit Price (in usd per share) | $ 55.73 |  |  |  |  |  |  |  | $ 46.93 |  |  |  |  |  |
July 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stockholders |  | $ 3,094 |  |  |  | $ 3,206 |  |  |  |  |  | $ 3,206 |  |  |
Common Stockholders |  | 9,081 |  |  |  | 8,314 |  |  |  |  |  | 7,327 |  |  |
Limited Partnership Unitholders |  | $ 3,115 |  |  |  | $ 2,879 |  |  |  |  |  | $ 2,489 |  |  |
Dividend Reinvestments, Common Stock Issued (in shares) |  | 56,003 |  |  |  | 57,696 |  |  |  |  |  | 138,019 |  |  |
Dividend Reinvestments, Discounted Share Price (in usd per share) |  | $ 50.30 |  |  |  | $ 46.79 |  |  |  |  |  | $ 45.21 |  |  |
Dividend Reinvestments, Limited Partnership Units Issued (in shares) |  | 32,041 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend Reinvestments, Average Unit Price (in usd per share) |  | $ 50.30 |  |  |  |  |  |  |  |  |  |  |  |  |
April 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stockholders |  |  | $ 3,094 |  |  |  | $ 3,206 |  |  | $ 4,364 |  |  |  |  |
Common Stockholders |  |  | 9,055 |  |  |  | 8,269 |  |  | 7,272 |  |  |  |  |
Limited Partnership Unitholders |  |  | $ 3,104 |  |  |  | $ 2,838 |  |  | $ 2,489 |  |  |  |  |
Dividend Reinvestments, Common Stock Issued (in shares) |  |  | 54,921 |  |  |  | 60,212 |  |  | 142,839 |  |  |  |  |
Dividend Reinvestments, Discounted Share Price (in usd per share) |  |  | $ 50.21 |  |  |  | $ 44.14 |  |  | $ 42.85 |  |  |  |  |
Dividend Reinvestments, Limited Partnership Units Issued (in shares) |  |  | 25,264 |  |  |  | 104,831 |  |  |  |  |  |  |  |
Dividend Reinvestments, Average Unit Price (in usd per share) |  |  | $ 50.21 |  |  |  | $ 44.77 |  |  |  |  |  |  |  |
January 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stockholders |  |  |  | $ 3,093 |  |  |  | $ 3,206 |  |  | $ 3,785 |  |  |  |
Common Stockholders |  |  |  | 8,403 |  |  |  | 7,415 |  |  | 7,218 |  |  |  |
Limited Partnership Unitholders |  |  |  | $ 2,880 |  |  |  | $ 2,521 |  |  | $ 2,489 |  |  |  |
Dividend Reinvestments, Common Stock Issued (in shares) |  |  |  | 42,975 |  |  |  | 39,588 |  |  | 145,468 |  |  |  |
Dividend Reinvestments, Discounted Share Price (in usd per share) |  |  |  | $ 56.74 |  |  |  | $ 45.15 |  |  | $ 41.67 |  |  |  |
Dividend Reinvestments, Limited Partnership Units Issued (in shares) |  |  |  | 20,796 |  |  |  | 91,352 |  |  |  |  |  |  |
Dividend Reinvestments, Average Unit Price (in usd per share) |  |  |  |  |  |  |  | $ 45.80 |  |  |  |  | $ 56.74 |  |

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