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Stockholders' Equity - Additional Information (Detail) - USD ($) |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 27, 2015 | Jul. 16, 2015 | Jun. 09, 2015 | Apr. 28, 2015 | Mar. 27, 2015 | Feb. 20, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Nov. 04, 2014 | Apr. 22, 2014
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share (usd per share) |  | $ 0.06 |  | $ 0.06 |  | $ 0.06 | $ 0.06 | $ 0.03 | $ 0.18 | $ 0.06 |  |
Payments of common stock dividends |  | $ 3,800,000 | $ 3,700,000 |  | $ 3,800,000 |  |  |  | $ 11,300,000 | $ 3,800,000 |  |
Authorized amount |  |  |  |  |  |  |  |  |  |  | $ 75,000,000 | $ 15,000,000
Shares acquired |  |  |  |  |  |  | 394,430 |  | 724,792 |  |  |
Payments for repurchase of common stock |  |  |  |  |  |  | $ 5,600,000 |  | $ 10,600,000 | $ 6,700,000 |  |
April 2014 Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments for repurchase of common stock |  |  |  |  |  |  | $ 15,000,000 |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share (usd per share) | $ 0.07 |  |  |  |  |  |  |  |  |  |  |

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