Annual report pursuant to Section 13 and 15(d)

Income Taxes - Reconciliation of Unrecognized Tax Benefit (Detail)

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Income Taxes - Reconciliation of Unrecognized Tax Benefit (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Reconciliation Of Unrecognized Tax Benefits [Line Items]      
Balance at beginning of year $ 47,379 $ 50,632 $ 45,201
Additions based on tax positions related to the current year 15,411 10,133 10,602
Additions for tax positions of prior years 1,607 131 5,183
Reductions for tax positions of prior years (293)    
Reductions for audit settlements (895) (4,877) (93)
Reductions resulting from a lapse of the applicable statutes of limitations (11,965) (8,640) (10,261)
Balance at end of year $ 51,244 $ 47,379 $ 50,632