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Stockholders' Equity - Additional Information (Detail) - USD ($) |  | 3 Months Ended |
--- | --- | --- | ---
Jan. 22, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Sep. 30, 2017
Equity [Line Items] |  |  |  |
Treasury shares acquired |  | 93,000 |  |
Dividends per share declared on outstanding common stock | $ 0.14 | $ 0.14 | $ 0.14 |
Dividends payable date | Mar. 12, 2018 |  |  |
Dividends payable, shareholders record date | Feb. 28, 2018 |  |  |
September 2017 Share Repurchase Program [Member] |  |  |  |
Equity [Line Items] |  |  |  |
Treasury shares acquired |  | 92,749 |  |
Shares repurchased during period |  | $ 2,700,000 |  |
Maximum [Member] | September 2017 Share Repurchase Program [Member] |  |  |  |
Equity [Line Items] |  |  |  |
Amount of shares authorized to repurchase |  |  |  | $ 20,000,000

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