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Stockholders' Equity - Additional Information (Detail) - 2016 Stock Repurchase Program - USD ($) | Mar. 31, 2018 | Dec. 01, 2017 | May 18, 2017 | Jun. 02, 2016
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Stockholders Equity [Line Items] |  |  |  |
Stock repurchase program authorized amount |  | $ 300,000,000 |  | $ 100,000,000
Stock repurchase program additional amount authorized |  | $ 100,000,000.0 | $ 100,000,000 |
Available amount under repurchase program | $ 99,100,000 |  |  |

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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