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Financial Liabilities Measured at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Acquisition-related contingent consideration, including current portion	$ 13,616	$ 13,285	$ 16,426	$ 9,850	$ 8,237	$ 14,990
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	$ 13,616		$ 16,426

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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
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