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Shareholders' Equity - Narrative (Detail) $ / shares in Units, $ in Millions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |
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Dec. 15, 2017 $ / shares | Sep. 15, 2017 $ / shares | Jun. 15, 2017 $ / shares | Mar. 15, 2017 $ / shares | Dec. 15, 2016 $ / shares | Nov. 09, 2016 USD ($) $ / shares shares | Sep. 16, 2016 USD ($) $ / shares shares | Sep. 15, 2016 $ / shares | Aug. 11, 2016 USD ($) shares | Jun. 15, 2016 $ / shares | Apr. 28, 2016 USD ($) $ / shares shares | Mar. 15, 2016 $ / shares | Jan. 29, 2016 USD ($) $ / shares shares | May 18, 2015 USD ($) $ / shares shares | Dec. 31, 2017 series $ / shares shares | Dec. 31, 2016 $ / shares shares | Dec. 31, 2015 shares | Nov. 30, 2013
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of outstanding shares authorized for repurchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00%
Premium percent over current book value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00%
Stock repurchases (shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Warrants outstanding to purchase common stock (shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,187 | 184,706 |  |
Share price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21.38 |  |  |
Number of preferred stock series outstanding | series |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |
Preferred stock, par value (usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.00 | $ 1.00 |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price of common stock (usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.55 | 9.55 |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price of common stock (usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 73.01 | $ 73.01 |  |
Series F Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividends paid (usd per share) | $ 0.375 | $ 0.375 | $ 0.375 | $ 0.375 | $ 0.370833 |  |  |  |  |  |  |  |  |  |  |  |  |
Series E Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividends paid (usd per share) | 0.403125 | 0.403125 | 0.403125 | 0.403125 | 0.403125 |  |  | $ 0.403125 |  | $ 0.210521 |  |  |  |  |  |  |  |
Series D Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividends paid (usd per share) | 0.40625 | 0.40625 | 0.40625 | 0.40625 | 0.40625 |  |  | 0.40625 |  | 0.40625 |  | $ 0.2076 |  |  |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, redemption price (usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25.00 |  |  |  |
Preferred stock, dividends paid (usd per share) | $ 0.4375 | $ 0.4375 | $ 0.4375 | $ 0.4375 | $ 0.4375 |  |  | $ 0.4375 |  | $ 0.4375 |  | $ 0.4375 |  |  |  |  |  |
Public Stock Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, number of shares issued in transaction (shares) | shares |  |  |  |  |  | 2,415,000 |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, price per share (USD per share) |  |  |  |  |  | $ 25.00 |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, consideration received | $ |  |  |  |  |  | $ 58.3 |  |  |  |  |  |  |  |  |  |  |  |
Public Stock Offering | Series F Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, number of shares issued in transaction (shares) | shares |  |  |  |  |  |  | 3,400,000 |  |  |  |  |  |  |  |  |  |  |
Sale of stock, price per share (USD per share) |  |  |  |  |  |  | $ 25.00 |  |  |  |  |  |  |  |  |  |  |
Sale of stock, consideration received | $ |  |  |  |  |  |  | $ 82.2 |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (usd per share) |  |  |  |  |  |  | $ 1.00 |  |  |  |  |  |  |  |  |  |  |
Preferred stock, fixed dividend rate |  |  |  |  |  |  | 6.00% |  |  |  |  |  |  |  |  |  |  |
Public Stock Offering | Series F Preferred Stock | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, floating dividend rate |  |  |  |  |  |  | 4.762% |  |  |  |  |  |  |  |  |  |  |
Public Stock Offering | Series E Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, number of shares issued in transaction (shares) | shares |  |  |  |  |  |  |  |  |  |  | 2,300,000 |  |  |  |  |  |  |
Sale of stock, price per share (USD per share) |  |  |  |  |  |  |  |  |  |  | $ 25.00 |  |  |  |  |  |  |
Sale of stock, consideration received | $ |  |  |  |  |  |  |  |  |  |  | $ 55.6 |  |  |  |  |  |  |
Preferred stock, par value (usd per share) |  |  |  |  |  |  |  |  |  |  | $ 1.00 |  |  |  |  |  |  |
Preferred stock, fixed dividend rate |  |  |  |  |  |  |  |  |  |  | 6.45% |  |  |  |  |  |  |
Public Stock Offering | Series E Preferred Stock | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, floating dividend rate |  |  |  |  |  |  |  |  |  |  | 5.14% |  |  |  |  |  |  |
Public Stock Offering | Series D Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, number of shares issued in transaction (shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |
Sale of stock, price per share (USD per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 25.00 |  |  |  |  |
Sale of stock, consideration received | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 24.1 |  |  |  |  |
Preferred stock, par value (usd per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.00 |  |  |  |  |
Preferred stock, fixed dividend rate |  |  |  |  |  |  |  |  |  |  |  |  | 6.50% |  |  |  |  |
Public Stock Offering | Series D Preferred Stock | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, floating dividend rate |  |  |  |  |  |  |  |  |  |  |  |  | 5.09% |  |  |  |  |
Public Stock Offering | Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, number of shares issued in transaction (shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,300,000 |  |  |  |
Sale of stock, price per share (USD per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25.00 |  |  |  |
Sale of stock, consideration received | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 55.6 |  |  |  |
Preferred stock, par value (usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.00 |  |  |  |
Preferred stock, fixed dividend rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.00% |  |  |  |
Public Stock Offering | Series C Preferred Stock | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, floating dividend rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.30% |  |  |  |
At Market Issuance Sales Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, number of shares issued in transaction (shares) | shares |  |  |  |  |  |  |  |  | 219,386 |  |  |  |  |  |  |  |  |
Sale of stock, consideration received | $ |  |  |  |  |  |  |  |  | $ 5.5 |  |  |  |  |  |  |  |  |
Common stock, offering price | $ |  |  |  |  |  |  |  |  | $ 50.0 |  |  |  |  |  |  |  |  |

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