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Subsequent Events - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Nov. 06, 2018 | Oct. 16, 2018 | Sep. 30, 2018 | Nov. 14, 2018
Subsequent Event [Line Items] |  |  |  |
Stock repurchased, shares |  |  | 900,000 |
Shares repurchased, average price per share |  |  | $ 15.75 |
Additional shares authorized for purchase |  |  | 2,700,000 |
Scenario Forecast [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Quarterly dividend payable subsequent to balance sheet date |  |  |  | $ 4.3
Subsequent Events [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Dividend declaration date |  | Oct. 16, 2018 |  |
Common stock dividends per share declared |  | $ 0.09 |  |
Dividend record date |  | Oct. 31, 2018 |  |
Dividend payment date |  | Nov. 14, 2018 |  |
Stock repurchased, shares | 100,000 |  |  |
Shares repurchased, average price per share | $ 13.60 |  |  |
Additional shares authorized for purchase | 2,600,000 |  |  |

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