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Income Taxes - Summary of (Benefit from) Provision for Income Taxes and Effective Tax Rate from Continuing Operations (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Tax Disclosure [Abstract]        
Pretax loss $ (11,485) $ (31,651) $ (46,693) $ (64,757)
Provision for (benefit from) income taxes $ 35 $ 1,116 $ (923) $ 3,190
Effective rate 0.30% 3.50% (2.00%) 4.90%