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Commitments and Contingencies - Additional Information (Detail) $ in Millions		6 Months Ended
	Mar. 31, 2020 Officer	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Mar. 31, 2021 USD ($)
Contingencies And Commitments [Line Items]
Commitments related to performance bonds		$ 21.8	$ 22.9
Commitments related to performance bonds expiration month and year		2025-04
Commitments towards private equity funds		$ 4.9
Investment Commitments [Member]
Contingencies And Commitments [Line Items]
Aggregate investment committed in private equity funds		$ 5.0
Minimum [Member]
Contingencies And Commitments [Line Items]
Collateral value required to be maintained				$ 15.0
Current Executive Officers [Member]
Contingencies And Commitments [Line Items]
Number of officers | Officer	2
Former Executive Officers [Member]
Contingencies And Commitments [Line Items]
Number of officers | Officer	1

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- Definition

Commitments related to performance bonds.

+ References

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- Definition

Commitments related to performance bonds expiration month and year.

+ References

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- Definition

Amount of contributions made that have been applied to private equity fund commitments.

+ References

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- Definition

Contingencies and commitments.

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Number of officers.

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- Definition

Amount of assets pledged to secure a debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 942
-SubTopic 470
-Section 50
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- Definition

Cost of the investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841

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