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Legal Matters - Additional Information (Detail) $ in Millions |  | 9 Months Ended |
--- | --- | --- | ---
Aug. 05, 2015 Plaintiff | Sep. 30, 2021 | Sep. 30, 2019 USD ($)
Robles Lawsuits [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Complaint filed date |  | January 25, 2013 |
Number of plaintiffs against HGT | 63 |  |
Number of employees filed lawsuit | 5 |  |
Robles and Adame Lawsuits | Accrued Other [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Claims settlement recorded in consolidated balance sheet | $ |  |  | $ 4.8

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