Annual report pursuant to Section 13 and 15(d)

Income Taxes - Summary of Earnings (Loss) Before Income Taxes (Detail)

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Income Taxes - Summary of Earnings (Loss) Before Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Contingency [Line Items]      
Expected income tax expense (benefit) $ 3,666 $ (45,866) $ 68,811
State income tax, net of federal benefit 1,406 (7,320) 6,590
Rate differential on foreign income (8,752) (11,808) (16,398)
Change in unrecognized tax benefits (149) 2,906 (160)
Non-deductible expenses 194 168 569
Prior year R&D credit claims 0 (6,253) 0
Other 79 304 (197)
Change in valuation allowance 3,517 4,402 983
Total income taxes (benefit) $ (39) $ (63,467) $ 60,198