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Software and Other Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Software, net	$ 108,268,000		$ 22,598,000
Software, accumulated amortization	59,700,000
Other intangible assets amortization expense	2,300,000	1,600,000
Software Marketed for External Sale
Finite-Lived Intangible Assets [Line Items]
Software, net	91,300,000
Software, amortization expense	2,800,000	1,600,000
Software estimated useful life, minimum	3
Software estimated useful life, maximum	10
Software Acquired or Developed for Internal Use
Finite-Lived Intangible Assets [Line Items]
Software, net	17,000,000
Software, amortization expense	$ 2,500,000	$ 1,900,000

For each balance sheet presented, the amount of accumulated amortization for capitalized computer software costs.

For each income statement presented, the amount charged to expense for amortization of capitalized computer software costs.

The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date.