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Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Tax Disclosure [Abstract]        
(Provision for) benefit from income taxes $ (327) $ (2,448) $ (355) $ 2,868