v2.4.0.6

Summary of Significant Accounting Policies (Schedule of Useful Lives of Finite Lived Intangible Assets) (Detail)	9 Months Ended
	Sep. 30, 2012
Acquired Methodologies/Technology [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets useful life (in Years)	3 years
Acquired Methodologies/Technology [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets useful life (in Years)	10 years
Customer Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets useful life (in Years)	3 years
Customer Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets useful life (in Years)	12 years
Panel [Member]
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets useful life (in Years)	7 years
Intellectual Property [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets useful life (in Years)	7 years
Intellectual Property [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets useful life (in Years)	13 years
Trade Names [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets useful life (in Years)	2 years
Trade Names [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets useful life (in Years)	10 years

X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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

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