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Intangible Assets - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2012
Customer Lists
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible asset estimated useful life	3 years
Trademarks, Patents and Copyrights
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible asset estimated useful life	4 years
Trademarks, Patents and Copyrights | Minimum
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible asset estimated useful life	2 years
Trademarks, Patents and Copyrights | Maximum
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible asset estimated useful life	7 years

X

- Details

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Namespace Prefix:	us-gaap_
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X

- 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.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration