Revenue (Details) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	[1]	Jun. 30, 2018	Jun. 30, 2017	[1]	Jan. 01, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Total net revenues	$ 742,365,000	$ 693,227,000		$ 1,439,557,000	$ 1,355,904,000
Short-term contract liabilities	1,243,032,000			1,243,032,000			$ 1,250,000,000	$ 1,308,474,000
Long-term portion of deferred revenues	480,942,000			480,942,000			$ 512,800,000	$ 555,769,000
Impairment of capitalized costs	0			0
Deferred revenue recognized	456,600,000			784,700,000
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Total net revenues	237,144,000			407,877,000
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Total net revenues	505,221,000			$ 1,031,680,000
Minimum [Member]
Disaggregation of Revenue [Line Items]
Intangible asset life				3 years
Maximum [Member]
Disaggregation of Revenue [Line Items]
Intangible asset life				7 years
Customer Relationships [Member] | Minimum [Member]
Disaggregation of Revenue [Line Items]
Intangible asset life				3 years
Customer Relationships [Member] | Maximum [Member]
Disaggregation of Revenue [Line Items]
Intangible asset life				5 years
Sales, Marketing and Services Expense [Member]
Disaggregation of Revenue [Line Items]
Amortization of capitalized contract acquisition costs	$ 8,300,000			$ 16,200,000

[1] As noted above, prior period amounts have not been adjusted under the modified retrospective method. See Note 2 for further information regarding the Company’s adoption of the revenue recognition standard.