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Financial Assets and Liabilities Measured At Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 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	$ 16,426	[1]	$ 14,990	[1]	$ 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	$ 16,426		$ 14,990
[1] The short-term portion is included in "Accounts payable, accrued expenses and other." The long-term portion is included in "Other liabilities."

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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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Data Type:	xbrli:monetaryItemType
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