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Software and Other Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Software, net	$ 133,603,000		$ 133,603,000		$ 22,598,000
Software, accumulated amortization	69,000,000		69,000,000
Other intangible assets amortization expense	3,200,000	1,800,000	8,700,000	5,100,000
Software Marketed for External Sale
Finite-Lived Intangible Assets [Line Items]
Software, net	104,100,000		104,100,000
Software, amortization expense	3,800,000	1,500,000	10,000,000	4,800,000
Software Marketed for External Sale | Minimum
Finite-Lived Intangible Assets [Line Items]
Software estimated useful life			3 years
Software Marketed for External Sale | Maximum
Finite-Lived Intangible Assets [Line Items]
Software estimated useful life			10 years
Software Acquired or Developed for Internal Use
Finite-Lived Intangible Assets [Line Items]
Software, net	29,500,000		29,500,000
Software, amortization expense	$ 3,000,000	$ 2,100,000	$ 8,500,000	$ 6,000,000

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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- Definition

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

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

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