Impairment of Long-Lived Assets - Additional information (Detail)	3 Months Ended		12 Months Ended
	Dec. 31, 2015 USD ($) $ / bbl	Dec. 31, 2014 USD ($)	Dec. 31, 2016 USD ($) $ / bbl	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Impairment Of Long Lived Assets [Line Items]
Loss (gain) on disposal or impairment of assets			$ 889,000	$ 44,111,000	$ 15,079,000
Industry fully recovery period	5 years
Impairment of long-lived assets				36,177,000
Reclassification of China cumulative translation gain to Net Loss upon substantial liquidation				8,853,000
Gain on disposal of assets			176,000	230,000	41,000
AGPI
Impairment Of Long Lived Assets [Line Items]
Impairment of goodwill	$ 8,664,000
Impairment of trademark	833,000
CHINA
Impairment Of Long Lived Assets [Line Items]
Impairment of long-lived assets		$ 10,164,000
China assets impairment	1,033,000			1,033,000	10,164,000
Reclassification of China cumulative translation gain to Net Loss upon substantial liquidation	8,853,000			8,853,000
Marshfield, Wisconsin
Impairment Of Long Lived Assets [Line Items]
Impairment of long-lived assets					4,956,000
Bauxite raw materials
Impairment Of Long Lived Assets [Line Items]
Impairment of long-term portion of the bauxite raw material	$ 6,488,000		1,065,000	6,488,000
StrataGen
Impairment Of Long Lived Assets [Line Items]
Impairment of goodwill			$ 0		0
Maximum
Impairment Of Long Lived Assets [Line Items]
Oil price per barrel | $ / bbl	30
Minimum
Impairment Of Long Lived Assets [Line Items]
Oil price per barrel | $ / bbl			50
Long Lived Asset Impairments
Impairment Of Long Lived Assets [Line Items]
Loss (gain) on disposal or impairment of assets			$ 1,065,000	$ 43,697,000	$ 15,120,000