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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Line Items]
Maintenance agreements renewal period		1 year
Net capitalized software costs		$ 4,200,000us-gaap_CapitalizedComputerSoftwareNet	$ 3,500,000us-gaap_CapitalizedComputerSoftwareNet
Amortization expense related to capitalized software development costs		1,800,000	1,000,000	500,000
Foreign currency transaction gains (losses)		2,900,000	3,400,000	(12,400,000)
Increase (reduction) in contingent consideration liability	400,000
Other income (charges) relating to the contingent liability		2,754,000us-gaap_OtherNonoperatingIncomeExpense	3,498,000us-gaap_OtherNonoperatingIncomeExpense	(15,875,000)us-gaap_OtherNonoperatingIncomeExpense
Cash equivalents, maturity period		3 months
Depreciation expense		14,300,000us-gaap_Depreciation	14,700,000us-gaap_Depreciation	10,700,000us-gaap_Depreciation
Goodwill impairment loss		0	0
Indefinite lived intangible assets		0	0
Impairment of long-lived assets held for use		0	0
Concentration of credit risk		0ssnc_ConcentrationRiskCreditRiskValue	0ssnc_ConcentrationRiskCreditRiskValue
Stock Options [Member]
Accounting Policies [Line Items]
Options to purchase shares outstanding		1,841,840	133,598	703,446
GlobeOp [Member]
Accounting Policies [Line Items]
Foreign currency transaction gains (losses)				(3,800,000)
Prime [Member]
Accounting Policies [Line Items]
Increase (reduction) in contingent consideration liability		400,000
BenefitsXML Inc [Member]
Accounting Policies [Line Items]
Increase (reduction) in contingent consideration liability				0
Other income (charges) relating to the contingent liability				300,000
Completed Technology and Other [Member]
Accounting Policies [Line Items]
Amortization expense associated with completed technology and other amortizable intangible assets		$ 83,700,000	$ 84,100,000	$ 64,600,000
Minimum [Member]
Accounting Policies [Line Items]
Tax benefit realized upon settlement		50.00%
Minimum [Member] \| Software Development [Member]
Accounting Policies [Line Items]
Completed technology and other identifiable intangible assets are amortized over lives		2 years
Minimum [Member] \| Completed Technology and Other [Member]
Accounting Policies [Line Items]
Completed technology and other identifiable intangible assets are amortized over lives		3 years
Maximum [Member] \| Software Development [Member]
Accounting Policies [Line Items]
Completed technology and other identifiable intangible assets are amortized over lives		5 years
Maximum [Member] \| Completed Technology and Other [Member]
Accounting Policies [Line Items]
Completed technology and other identifiable intangible assets are amortized over lives		17 years
Software-enabled Services [Member] \| Minimum [Member]
Accounting Policies [Line Items]
Revenue recognition period		1 year
Software-enabled Services [Member] \| Maximum [Member]
Accounting Policies [Line Items]
Revenue recognition period		5 years
Software Licenses [Member] \| Minimum [Member]
Accounting Policies [Line Items]
Revenue recognition period		1 year
Software Licenses [Member] \| Maximum [Member]
Accounting Policies [Line Items]
Revenue recognition period		7 years