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Stockholders' Equity - Additional Information (Detail) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Sep. 30, 2017
Equity [Line Items] |  |
Treasury shares acquired | 342,000 |
September 2017 Share Repurchase Program [Member] |  |
Equity [Line Items] |  |
Treasury shares acquired | 342,749 |
Shares repurchased during period | $ 11,100,000 |
Maximum [Member] | September 2017 Share Repurchase Program [Member] |  |
Equity [Line Items] |  |
Amount of shares authorized to repurchase |  | $ 20,000,000

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