Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Line Items]
Reclassification of software licenses to maintenance and term licenses	$ 19,200,000		$ 10,000,000	$ 9,500,000
Maintenance agreements renewal period		1 year
Net capitalized software costs		$ 4,700,000	4,200,000
Amortization expense related to capitalized software development costs		2,400,000	1,800,000	1,000,000
Foreign currency transaction gains		3,400,000	2,900,000
Other income (charges) relating to the contingent liability		$ 3,878,000	2,754,000	3,498,000
Cash equivalents, maturity period		3 months
Cash equivalents		$ 303,100,000	0
Depreciation expense		18,900,000	14,300,000	$ 14,700,000
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		$ 0	$ 0
Deferred financing fees recorded to reduce in long-tem debt	$ 55,800,000
Stock Options [Member]
Accounting Policies [Line Items]
Options to purchase shares outstanding		3,500,828	1,841,840	133,598
Prime [Member]
Accounting Policies [Line Items]
Increase (reduction) in contingent consideration liability			$ 400,000
Completed Technology and Other [Member]
Accounting Policies [Line Items]
Amortization expense associated with completed technology and other amortizable intangible assets		$ 129,500,000	$ 83,700,000	$ 84,100,000
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
Minimum [Member] | Software-enabled Services [Member]
Accounting Policies [Line Items]
Revenue recognition period		1 year
Minimum [Member] | Perpetual Licenses [Member]
Accounting Policies [Line Items]
Revenue recognition period		1 year
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
Maximum [Member] | Software-enabled Services [Member]
Accounting Policies [Line Items]
Revenue recognition period		5 years
Maximum [Member] | Perpetual Licenses [Member]
Accounting Policies [Line Items]
Revenue recognition period		7 years