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Legal Matters - Additional Information (Detail) $ in Millions		1 Months Ended
	Aug. 05, 2015 Plaintiff Employee	Sep. 30, 2020 USD ($)
Robles Lawsuits [Member]
Loss Contingencies [Line Items]
Number of plaintiffs against HGT | Plaintiff	63
Number of employees filed lawsuit | Employee	5
Robles and Adame Lawsuits | Accrued Other [Member]
Loss Contingencies [Line Items]
Claims settlement recorded in consolidated balance sheet		$ 4.8
Robles and Adame Lawsuits | General and Administrative Expense
Loss Contingencies [Line Items]
Claims settlement recorded in consolidated statement of income and comprehensive income		$ 4.8

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Accrued litigation settlement, current.

+ References

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Number of employees filed lawsuit.

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Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.

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- Definition

The total number of new claims filed pertaining to a loss contingency during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349

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