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Schedule of Intangible Assets Recognized in Connection with Product Acquisitions (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Business Acquisition [Line Items] |  |  |
Beginning Balance | $ 116,189 | $ 115,249 | $ 86,973
Acquisitions during fiscal | 3,473 | 316 | 32,677
Impact of movement in exchange rates and other adjustments | (118) | (161) | 63
Other Adjustments related to deferred liabilities |  | 6,802 |
Amortization expense | (6,023) | (6,017) | (4,464)
Ending Balance | $ 113,521 | $ 116,189 | $ 115,249

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