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Equity Transactions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 15, 2017 | Mar. 31, 2017 | Mar. 31, 2016 | Feb. 01, 2020 | Feb. 01, 2017
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Common stock available to repurchase (in shares) |  | 200,000 |  |  |
Common stock authorized to be repurchased (in shares) |  | 3,430,045 |  |  |
Proceeds from stock issuance |  | $ 220.1 |  |  |
Common stock cash dividends declared per share (in $ per share) | $ 0.45 | $ 0.45 | $ 0.45 |  |
Preferred stock cash dividends declared per share (in $ per share) | $ 1.8125 | $ 1.8125 | $ 0 |  |
Common stock |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Common stock issued (in shares) |  | 1,046,500 |  |  |
Convertible preferred stock |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Common stock issued (in shares) |  | 1,150,000 |  |  |
Convertible preferred stock dividend rate |  | 7.25% |  |  |
Convertible preferred stock liquidation preference (in dollars per share) |  | $ 100.00 |  |  | $ 100.00
Convertible preferred stock, threshold consecutive trading days |  | 20 days |  |  |
Minimum | Forecast | Convertible preferred stock |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Convertible preferred stock, shares issued upon conversion (in shares) |  |  |  | 0.7576 |
Maximum | Forecast | Convertible preferred stock |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Convertible preferred stock, shares issued upon conversion (in shares) |  |  |  | 0.9091 |

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