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Reconciliations of Gross Unrecognized Tax Benefits (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Contingency [Line Items]      
Beginning balance $ 26,469 $ 24,260 $ 29,962
Gross increases for tax positions in prior periods 2,198 2,042 286
Gross decreases for tax positions in prior periods (641) (192) (2,490)
Gross increases based on tax positions related to the current year 13,641 3,201 1,431
Gross decreases related to settlements with taxing authorities (13,202) (2,465) (4,182)
Reductions due to statute expiration (370) (377) (747)
Gross increases due to acquisitions 25,938    
Gross increases due to currency fluctuations 438    
Ending balance $ 54,471 $ 26,469 $ 24,260