Annual report pursuant to Section 13 and 15(d)

Income Taxes - Components of Changes in Unrecognized Tax Benefits (Detail)

v2.4.0.6
Income Taxes - Components of Changes in Unrecognized Tax Benefits (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Taxes [Line Items]      
Unrecognized tax benefits - January 1 $ 4,440 $ 4,433 $ 2,879
Gross increases - tax positions in current period   7 1,557
Gross increases - tax positions in prior period         
Gross decreases - tax positions in prior period (1,438)   (3)
Unrecognized tax benefits - December 31 3,002 4,440 4,433
Amount of unrecognized tax benefit that, if recognized would affect the company's effective tax rate $ 3,002 $ 4,440 $ 4,433