Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 272,194	$ 280,683
Subscription-based revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	265,315	272,487
Non-subscription-based revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	6,879	8,196
Domestic
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	197,787	205,942
International
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	74,407	74,741
Direct revenue from subscriptions | Subscription-based revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	243,368	250,225
Professional services | Subscription-based revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	3,718	3,718
Reseller revenue | Subscription-based revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	18,229	18,544
MDF | Non-subscription-based revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,679	2,048
Premium domains | Non-subscription-based revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	3,995	4,867
Domain parking and monetization | Non-subscription-based revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,205	1,281
Web Presence
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	174,290	177,943
Web Presence | Subscription-based revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	167,501	169,909
Web Presence | Non-subscription-based revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	6,789	8,034
Web Presence | Domestic
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	107,451	111,129
Web Presence | International
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	66,839	66,814
Web Presence | Direct revenue from subscriptions | Subscription-based revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	147,045	148,915
Web Presence | Professional services | Subscription-based revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	3,148	3,328
Web Presence | Reseller revenue | Subscription-based revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	17,308	17,666
Web Presence | MDF | Non-subscription-based revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,589	1,886
Web Presence | Premium domains | Non-subscription-based revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	3,995	4,867
Web Presence | Domain parking and monetization | Non-subscription-based revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,205	1,281
Digital Marketing
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	97,904	102,740
Digital Marketing | Subscription-based revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	97,814	102,578
Digital Marketing | Non-subscription-based revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	90	162
Digital Marketing | Domestic
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	90,336	94,813
Digital Marketing | International
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	7,568	7,927
Digital Marketing | Direct revenue from subscriptions | Subscription-based revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	96,323	101,310
Digital Marketing | Professional services | Subscription-based revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	570	390
Digital Marketing | Reseller revenue | Subscription-based revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	921	878
Digital Marketing | MDF | Non-subscription-based revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	90	162
Digital Marketing | Premium domains | Non-subscription-based revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Digital Marketing | Domain parking and monetization | Non-subscription-based revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 0	$ 0