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Stockholders' Equity and Noncontrolling Interest - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 12, 2014 | Feb. 12, 2013 | Mar. 31, 2013 | Mar. 31, 2008 | Nov. 30, 2003 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Income attributable to noncontrolling interests |  |  |  |  |  | $ 10,463 | $ 11,045 | $ 3,970
Series A Preferred Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of depositary shares sold |  |  |  |  | 4,000,000 |  |  |
Dividend rate on preferred stock |  |  |  |  | 8.00% |  |  |
Depositary shares, redeemable price (in usd per share) |  |  |  |  | $ 25.00 |  |  |
Annual dividend on depositary shares |  |  |  |  | 2.00 |  |  |
Cumulative redeemable preferred stock liquidation preference |  |  |  |  | $ 25.00 |  |  |
Percentage of redeemable preferred stock |  |  | 60.00% |  |  |  |  |
Depository shares to cumulative redeemable preferred stock ratio |  |  |  |  | 1.00% |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of depositary shares sold |  |  |  | 3,173,115 |  |  |  |
Dividend rate on preferred stock |  |  |  | 9.00% |  |  |  |
Depositary shares, redeemable price (in usd per share) |  |  |  | $ 25.00 |  |  |  |
Annual dividend on depositary shares |  |  |  | 2.25 |  |  |  |
Cumulative redeemable preferred stock liquidation preference |  |  |  | $ 25.00 |  |  |  |
Depository shares to cumulative redeemable preferred stock ratio |  |  |  | 1.00% |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of depositary shares sold | 1,600,000 | 5,600,000 |  |  |  |  |  |
Dividend rate on preferred stock |  | 6.875% |  |  |  |  |  |
Annual dividend on depositary shares |  | $ 1.71875 |  |  |  |  |  |
Cumulative redeemable preferred stock liquidation preference |  | $ 25.00 |  |  |  |  |  |
Percentage of redeemable preferred stock |  | 6.875% |  |  |  |  |  |
Depository shares to cumulative redeemable preferred stock ratio |  | 1.00% |  |  |  |  |  |
Series C preferred stock | $ 39,260 | $ 135,200 |  |  |  | $ 0 | $ 39,260 | $ 135,221

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