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Restructuring Activities and COVID -19 Update - Summary of restructuring costs (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 6.6
Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	5.4
Lease Termination [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	1.2
Sales and marketing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	2.7
Sales and marketing [Member] | Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	1.5
Sales and marketing [Member] | Lease Termination [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	1.2
Operations and support [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	2.8
Operations and support [Member] | Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	2.8
Research and development[Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0.7
Research and development[Member] | Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0.7
General and administrative [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0.4
General and administrative [Member] | Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 0.4

X

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to 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
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 230
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-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

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