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Stockholder's Equity - Schedule of Shares Repurchased (Detail) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Nov. 03, 2020 | Nov. 06, 2019 | May 06, 2019 | Dec. 12, 2018
Equity [Line Items] |  |  |  |  |  |  |
Shares repurchased during the period | $ 28,921,000 | $ 66,186,000 | $ 25,276,000 |  |  |  |
December Two Thousand Twenty Share Repurchase Program [Member] |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Shares repurchased (in shares) | 45,705 | 0 |  |  |  |  |
Shares repurchased during the period | $ 593,000 |  |  |  |  |  |
Shares repurchased during period (in dollars per share) | $ 12.98 |  |  |  |  |  |
December Two Thousand Twenty Share Repurchase Program [Member] | Maximum [Member] |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Amount of stock repurchase plan authorized |  |  |  | $ 20,000,000 |  |  |
November Two Thousand Nineteen Share Repurchase Program [Member] |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Shares repurchased (in shares) | 1,565,078 | 403,142 |  |  |  |  |
Shares repurchased during the period | $ 40,000,000 |  |  |  |  |  |
Shares repurchased during period (in dollars per share) | $ 20.32 |  |  |  |  |  |
November Two Thousand Nineteen Share Repurchase Program [Member] | Maximum [Member] |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Amount of stock repurchase plan authorized |  |  |  |  | $ 40,000,000 |  |
May Two Thousand Nineteen Share Repurchase Program [Member] |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Shares repurchased (in shares) | 0 | 1,466,575 |  |  |  |  |
Shares repurchased during the period | $ 40,000,000 |  |  |  |  |  |
Shares repurchased during period (in dollars per share) | $ 27.27 |  |  |  |  |  |
May Two Thousand Nineteen Share Repurchase Program [Member] | Maximum [Member] |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Amount of stock repurchase plan authorized |  |  |  |  |  | $ 40,000,000 |
December Two Thousand Eighteen Share Repurchase Program [Member] |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Shares repurchased (in shares) | 0 | 468,108 |  |  |  |  |
Shares repurchased during the period | $ 14,513,000 |  |  |  |  |  |
Shares repurchased during period (in dollars per share) | $ 31.00 |  |  |  |  |  |
December Two Thousand Eighteen Share Repurchase Program [Member] | Maximum [Member] |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Amount of stock repurchase plan authorized |  |  |  |  |  |  | $ 20,000,000

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