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Income Taxes - Summary of Components of Income (Loss) Before Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule Of Income Before Income Tax Domestic And Foreign Line Items              
United States         $ 52,422 $ (61,434) $ 1,865
Foreign         18,555 (3,978) 9,640
Income (loss) before income taxes $ 17,230 $ 17,526 $ 35,905 $ 88,420 $ 70,977 $ (65,412) $ 11,505