Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Property, Plant and Equipment [Line Items]
Maximum maturity period for classification of investments as cash equivalents	3 months
Investments other-than-temporary losses	$ 0	$ 0
Contractual maturities accounts receivable	less than one year
Term for post-contract technical support	1 year
Term of agreement for revenue recognition	2 years
Forward Contracts [Member]
Property, Plant and Equipment [Line Items]
Number of foreign currency contracts	1
Internally Developed Software [Member]
Property, Plant and Equipment [Line Items]
Estimated life of intangible assets	3 years
Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of amortizable intangibles	3 years
Minimum [Member] | Business Combinations [Member]
Property, Plant and Equipment [Line Items]
Estimated life of intangible assets	3 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of amortizable intangibles	7 years
Maximum [Member] | Business Combinations [Member]
Property, Plant and Equipment [Line Items]
Estimated life of intangible assets	15 years