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Net Income Per Share - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Difference amount between basic and diluted net income per share (in dollars per share) | $ 0.01 | $ 0.01 | $ 0
Restricted Stock [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Net income | $ 1.0 | $ 1.0 | $ 1.0

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