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Other (Loss) Income - Summary of Other (Loss) Income (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Other Income and Expenses [Abstract]        
TIL stock purchase warrants received       $ 6,839
Volatile organic compound emission plant lease loss $ (14) $ (166) $ (54) (67)
Impairment of marketable securities (683)   (683)  
Miscellaneous income (loss) 308 (568) 723 745
Other (loss) income $ (389) $ (734) $ (14) $ 7,517