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Roll Forward of Unrecognized Tax Benefits and Associated Interest and Penalties Included in Balance Sheet (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Income Tax Contingency [Line Items]  
Beginning Balance $ 72,011
Changes in prior year tax positions (174)
Increase in current year tax positions 2,657
Reductions as a result of a lapse of the applicable statute of limitations (30)
Ending Balance 74,464
Gross Unrecognized Tax Benefits, Excluding Interest and Penalties
 
Income Tax Contingency [Line Items]  
Beginning Balance 69,633
Changes in prior year tax positions (174)
Increase in current year tax positions 222
Reductions as a result of a lapse of the applicable statute of limitations (30)
Ending Balance 69,651
Interest and Penalties
 
Income Tax Contingency [Line Items]  
Beginning Balance 2,378
Increase in current year tax positions 2,435
Ending Balance $ 4,813