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Stockholders' Equity - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | May 06, 2019 | Dec. 12, 2018 | Sep. 05, 2017
Equity [Line Items] |  |  |  |  |  |  |  |  |
Shares repurchased during period | $ 14,107,000 | $ 10,117,000 | $ 8,370,000 | $ 2,746,000 |  |  |  |  |
May Two Thousand Nineteen Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) |  |  |  |  | 338,274 |  |  |  |
Shares repurchased during period |  |  |  |  | $ 9,700,000 |  |  |  |
December Two Thousand Eighteen Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) |  |  |  |  | 468,108 |  |  |  |
Shares repurchased during period |  |  |  |  | $ 14,500,000 |  |  |  |
September Two Thousand Seventeen Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) |  |  |  |  |  | 342,749 |  |  |
Shares repurchased during period |  |  |  |  |  | $ 11,100,000 |  |  |
Maximum [Member] | May Two Thousand Nineteen Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |
Amount of shares authorized to repurchase |  |  |  |  |  |  | $ 40,000,000 |  |
Maximum [Member] | December Two Thousand Eighteen Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |
Amount of shares authorized to repurchase |  |  |  |  |  |  |  | $ 20,000,000 |
Maximum [Member] | September Two Thousand Seventeen Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |
Amount of shares authorized to repurchase |  |  |  |  |  |  |  |  | $ 20,000,000

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