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Software and Other Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Software, net	$ 177,836,000		$ 177,836,000		$ 129,314,000
Software, accumulated amortization	81,600,000		81,600,000
Other intangible assets amortization expense	4,800,000	3,200,000	8,600,000	5,500,000
Software Marketed for External Sale
Finite-Lived Intangible Assets [Line Items]
Software, net	96,000,000		96,000,000
Software, amortization expense	3,500,000	3,400,000	6,700,000	6,200,000
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	81,800,000		81,800,000
Software, amortization expense	$ 4,400,000	$ 3,000,000	$ 7,800,000	$ 5,500,000
Software Acquired or Developed for Internal Use | Minimum
Finite-Lived Intangible Assets [Line Items]
Software estimated useful life			3 years
Software Acquired or Developed for Internal Use | Maximum
Finite-Lived Intangible Assets [Line Items]
Software estimated useful life			10 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 985

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- Definition

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

+ References

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 985

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- Definition

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.

+ References

No definition available.

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