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Stockholders' Equity - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 18, 2018 | Nov. 02, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |
Stock issued for acquisition |  |  | $ 3,371 |  | $ 2,922
Treasury stock at cost |  |  | $ 19,864 | $ 5,815 |
Common Stock [Member] |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |
Stock issued for acquisition, Shares |  |  | 40,478 |  | 43,953
Stock repurchase program, authorized amount |  | $ 50,000 |  |  |
Stock repurchase program, period |  | 2 years |  |  |
Repurchase of treasury shares |  |  | (289,745) | (122,147) |
Stock repurchase program, available for future repurchases |  |  | $ 24,300 |  |
CovalentWorks [Member] |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |
Stock issued for acquisition, Shares | 40,478 |  |  |  |
Stock issued for acquisition | $ 3,371 |  |  |  |

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