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Stockholders' Equity (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jun. 15, 2017 | Mar. 14, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  | 450,000,000 | 450,000,000 |  | 450,000,000 |
Common stock, par value (in dollars per share) |  |  | $ 0.01 | $ 0.01 |  | $ 0.01 |
Preferred stock, shares authorized (in shares) |  |  | 50,000,000 | 50,000,000 |  | 50,000,000 |
Preferred stock, par value (in dollars per share) |  |  | $ 0.01 | $ 0.01 |  | $ 0.01 |
Common stock, shares issued (in shares) |  |  | 105,437,919 | 91,422,676 |  | 105,437,919 |
Common stock, shares outstanding (in shares) |  |  | 105,437,919 | 91,422,676 |  | 105,437,919 |
Dividend declared per share of common stock (in dollars per share) |  |  | $ 0.46 |  | $ 0.46 | $ 0.92 | $ 0.92
Proceeds from issuance of common stock as a result of follow-on public offering |  |  | $ 248,900 | $ 177,796 |  |  |
Common Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Dividend declared per share of common stock (in dollars per share) | $ 0.46 | $ 0.46 |  |  |  |  |
Series A Preferred Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  | 3,450,000 | 3,450,000 |  | 3,450,000 |
Preferred stock, shares outstanding (in shares) |  |  | 3,450,000 | 3,450,000 |  | 3,450,000 |
Dividend rate, preferred stock |  |  |  |  |  | 8.625% |
Dividend declared per share of preferred stock (in dollars per share) | 0.5391 | 0.5391 |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  | 8,000,000 | 8,000,000 |  | 8,000,000 |
Preferred stock, shares outstanding (in shares) |  |  | 8,000,000 | 8,000,000 |  | 8,000,000 |
Dividend declared per share of preferred stock (in dollars per share) | 0.5000 | 0.50 |  |  |  |  |
Series C Preferred Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  | 6,900,000 | 6,900,000 |  | 6,900,000 |
Preferred stock, shares outstanding (in shares) |  |  | 6,900,000 | 6,900,000 |  | 6,900,000 |
Dividend rate, preferred stock |  |  |  |  |  | 8.00% |
Dividend declared per share of preferred stock (in dollars per share) | $ 0.5000 | $ 0.5000 |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
New issuance of stock (shares) |  |  |  |  |  | 13,800,000 |
Common Stock [Member] | Follow On Public Offering [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
New issuance of stock (shares) |  |  | 13,800,000 | 10,500,000 |  |  |
Price per share of newly issued stock (in dollars per share) |  |  | $ 18.05 | $ 16.97 |  | $ 18.05 |

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