Business acquisition equity interest issued or issuable for each share of acquired entity.

No definition available.

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- Definition

Commitments related to performance bonds.

+ References

No definition available.

+ Details

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- Definition

Commitments related to performance bonds expiration month and year.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Contingencies and commitments.

+ References

No definition available.

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- Definition

Letter of credit secured by pledge of a portion of fixed income securities.

+ References

No definition available.

+ Details

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- Definition

Number of officers.

+ References

No definition available.

+ Details

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- Definition

Date when the business acquisition agreement was executed, in YYYY-MM-DD format.

+ References

No definition available.

+ Details

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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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
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823

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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 http://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841

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Commitments and Contingencies - Additional Information (Detail) $ in Millions			3 Months Ended
	Aug. 30, 2021 shares	Mar. 31, 2020 Officer	Mar. 31, 2022 USD ($)	Feb. 14, 2022	Jan. 26, 2022	Dec. 31, 2021 USD ($)	Mar. 31, 2021 USD ($)
Contingencies And Commitments [Line Items]
Commitments related to performance bonds			$ 20.9			$ 22.9
Commitments related to performance bonds expiration month and year			2025-04
Letter of credit secured by pledge of a portion of fixed income securities			$ 18.0
Commitments towards private equity funds			4.9
Investment Commitments [Member]
Contingencies And Commitments [Line Items]
Aggregate investment committed in private equity funds			5.0
Long-term Investments [Member]
Contingencies And Commitments [Line Items]
Letter of credit secured by pledge of a portion of fixed income securities			17.9
Minimum [Member]
Contingencies And Commitments [Line Items]
Collateral value required to be maintained							$ 15.0
Maximum [Member] \| Restricted Cash [Member]
Contingencies And Commitments [Line Items]
Letter of credit secured by pledge of a portion of fixed income securities			$ 0.1
Acorn HoldCo, Inc., [Member]
Contingencies And Commitments [Line Items]
Business combination date of agreement	Aug. 30, 2021
Percentage of ownership interest acquired				66.00%
Acorn HoldCo, Inc., [Member] \| Minimum [Member]
Contingencies And Commitments [Line Items]
Percentage of ownership interest acquired					60.00%
Acorn HoldCo, Inc., [Member] \| ADTRAN INC [Member]
Contingencies And Commitments [Line Items]
Percentage of ownership interest acquired	54.00%
Acorn HoldCo, Inc., [Member] \| ADTRAN INC [Member] \| Common Stock [Member]
Contingencies And Commitments [Line Items]
Number of shares issuable for each share of acquired entity \| shares	1
Acorn HoldCo, Inc., [Member] \| ADVA Optical Networking SE, [Member]
Contingencies And Commitments [Line Items]
Percentage of ownership interest acquired	46.00%
Acorn HoldCo, Inc., [Member] \| ADVA Optical Networking SE, [Member] \| Common Stock [Member]
Contingencies And Commitments [Line Items]
Number of shares issuable for each share of acquired entity \| shares	0.8244
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