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Leases - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Lessee Lease Description [Line Items]
Maximum initial term of leases which are not recorded on balance sheet	12 months
Selling, General and Administrative Expense [Member] | Abandonment of Leases Associated with Office Locations [Member]
Lessee Lease Description [Line Items]
Charges	$ 16.8
Accelerated amortization of right of use assets	14.7
Accelerated depreciation of leasehold improvements	$ 2.1

X

- Definition

Lessee maximum initial term of lease which are not recorded on balance sheet.

+ References

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- Definition

Restructuring and related cost, accelerated amortization of right-of-use asset.

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- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of accelerated depreciation charged against earnings associated with exit from or disposal of business activities or restructuring plan.

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