Commitments and Contingencies - Additional Information (Detail) - Constant Contact, Inc. - McGee vs Constant Contact $ in Millions	Aug. 07, 2015 defendant	Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items]
Loss contingency accrual \| $		$ 1.5
Number of defendants \| defendant	2

Amount of loss contingency liability.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant