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Financial Liabilities Measured At Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Acquisition-related contingent consideration, including current portion	$ 8,237	$ 15,276	$ 14,990	$ 23,882	$ 20,076	$ 19,864
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Acquisition-related contingent consideration, including current portion	$ 8,237		$ 14,990

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- Definition

Fair value, as of the period end date, of potential payments under the contingent consideration arrangement including cash and shares.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

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- Details

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