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Income Taxes - Summary of Provision for (Benefit from) Income Taxes and Effective Tax Rate from Continuing Operations (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Income Tax Disclosure [Abstract]        
Pretax (loss) income $ (479) $ (44,656) $ 23,990 $ (90,146)
Provision for (benefit from) income taxes $ 21 $ 35 $ 8,776 $ (923)
Effective rate 4.40% 0.10% 36.60% (1.00%)