Intangible Assets and Estimated Useful Lives (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2012
Minimum [Member] | Developed software and core technologies
Intangible Assets [Line Items]
Useful life of intangible assets acquired, in years	7 years
Minimum [Member] | Customer lists and contract backlog
Intangible Assets [Line Items]
Useful life of intangible assets acquired, in years	3 years
Minimum [Member] | Trade Names [Member]
Intangible Assets [Line Items]
Useful life of intangible assets acquired, in years	6 years
Maximum [Member] | Developed software and core technologies
Intangible Assets [Line Items]
Useful life of intangible assets acquired, in years	10 years
Maximum [Member] | Customer lists and contract backlog
Intangible Assets [Line Items]
Useful life of intangible assets acquired, in years	15 years
Maximum [Member] | Trade Names [Member]
Intangible Assets [Line Items]
Useful life of intangible assets acquired, in years	10 years