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Software and Other Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Finite-Lived Intangible Assets [Line Items]
Software, net	$ 129,314,000	$ 22,598,000
Software, accumulated amortization	69,400,000	54,700,000
Other intangible assets amortization expense	12,100,000	6,400,000	6,300,000
Minimum
Finite-Lived Intangible Assets [Line Items]
Software estimated useful life	3 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Software estimated useful life	20 years
Software Marketed for External Sale
Finite-Lived Intangible Assets [Line Items]
Software, net	100,400,000	10,300,000
Software, amortization expense	13,800,000	6,300,000	6,000,000
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	6 years
Software Acquired or Developed for Internal Use
Finite-Lived Intangible Assets [Line Items]
Software, net	28,900,000	12,300,000
Software, amortization expense	$ 11,600,000	$ 8,100,000	$ 7,400,000
Software estimated useful life	3 years

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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For each income statement presented, the amount charged to expense for amortization of 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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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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