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Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2019 | Nov. 15, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |
Total consideration transferred |  |  | $ 102,700 | $ 94,200
Business acquisition, contingent cash consideration |  |  |  | 18,000
Additional goodwill recognized |  |  | 55,872 | $ 39,664
Goodwill acquired during period net of assets acquired |  |  | 48,700 |
Poten & Partners [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition date |  | Nov. 15, 2018 |  |
Ed Broking [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition date | Jan. 31, 2019 |  |  |
2019 Acquisitions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Measurement period adjustments |  |  | $ 7,100 |

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