Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended		12 Months Ended	36 Months Ended
	Mar. 31, 2020 USD ($) reporting_unit Segment	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) reporting_unit	Dec. 31, 2019 USD ($) Segment
Accounting Policies [Line Items]
Number of reportable segments | Segment	2			3
Software development cost capitalized	$ 5,000,000.0	$ 3,200,000
Number of reporting units | reporting_unit	10
Goodwill impairment	$ 0
Goodwill	1,834,329,000		$ 1,835,310,000	$ 1,835,310,000
Reserves for refunds and chargebacks	300,000		300,000	300,000
Deferred revenue expected to be refunded	$ 1,800,000		1,900,000	1,900,000
Percentage of deferred revenue refunded within same fiscal month	84.00%
Percentage of deferred revenue refunded within 45 days	95.00%
Recognition of the beginning deferred revenue into revenue, as a result of performance obligations satisfied	$ 155,456,000
Recognition of the beginning deferred revenue into revenue, as a result of performance obligations satisfied	0
Deferred revenue	479,600,000
Web Presence
Accounting Policies [Line Items]
Goodwill	1,230,915,000		1,231,896,000	1,231,896,000
Contract with customer, asset	79,400,000
Capitalized contract cost amortization	11,000,000.0
Digital Marketing
Accounting Policies [Line Items]
Goodwill	603,414,000		$ 603,414,000	$ 603,414,000
Contract with customer, asset	11,100,000
Capitalized contract cost amortization	$ 1,400,000
Web Hosting | Weighted Average
Accounting Policies [Line Items]
Contract term	1 year
Web Hosting | Minimum
Accounting Policies [Line Items]
Contract term	30 days
Web Hosting | Maximum
Accounting Policies [Line Items]
Contract term	3 years
Discount Rate
Accounting Policies [Line Items]
Discount rate			0.105	0.105
Reporting Units With Goodwill Allocated
Accounting Policies [Line Items]
Number of reporting units | reporting_unit	5
Reporting Units Representing 97% Of Goodwill
Accounting Policies [Line Items]
Number of reporting units | reporting_unit			3
Reporting Units Representing 3% Of Goodwill
Accounting Policies [Line Items]
Number of reporting units | reporting_unit			2
Reporting Units Whose Fair Value Exceeds Carrying Value By 20%
Accounting Policies [Line Items]
Goodwill impairment testing, fair value In excess of carrying value, percent			20.00%
Reporting Units Whose Fair Value Does Not Exceed Carrying Value By 20%, Unit 1
Accounting Policies [Line Items]
Goodwill			$ 52,000,000.0	$ 52,000,000.0
Ecomdash
Accounting Policies [Line Items]
Goodwill			7,000,000.0	7,000,000.0
Combination of Different Legacy Brands
Accounting Policies [Line Items]
Goodwill			$ 1,200,000,000	$ 1,200,000,000
Goodwill impairment testing, fair value In excess of carrying value, percent			4.00%
Reporting Units Representing 3% Of Goodwill, Unit 1
Accounting Policies [Line Items]
Goodwill impairment			$ 10,000,000.0
Reporting Units Representing 3% Of Goodwill, Unit 2
Accounting Policies [Line Items]
Goodwill impairment			$ 2,300,000
Reporting Unit 1 Using Other Discount Rate | Discount Rate
Accounting Policies [Line Items]
Discount rate			0.130	0.130
Reporting Unit 2 Using Other Discount Rate | Discount Rate
Accounting Policies [Line Items]
Discount rate			0.135	0.135
Reporting Unit 3 Using Other Discount Rate | Discount Rate
Accounting Policies [Line Items]
Discount rate			0.155	0.155