Alternative Energy Tax Credits - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2009
Alternative Energy Tax Credits [Line Items]
(Provision) benefit for income taxes	$ (227,700,000)	$ (221,700,000)	$ 17,700,000
Cellulosic Biofuel Tax Credits
Alternative Energy Tax Credits [Line Items]
Refundable tax credit per gallon				$ 1.01
(Provision) benefit for income taxes			103,900,000
Alternative Energy Tax Credits
Alternative Energy Tax Credits [Line Items]
Refundable tax credit per gallon				$ 0.50
(Provision) benefit for income taxes			166,000,000
Tax Related to Cellulosic Biofuel Tax Credits
Alternative Energy Tax Credits [Line Items]
(Provision) benefit for income taxes			102,000,000
Accrued Interest Related to Cellulosic Biofuel Tax Credits
Alternative Energy Tax Credits [Line Items]
(Provision) benefit for income taxes			1,900,000
Boise Inc. | Alternative Energy Tax Credits
Alternative Energy Tax Credits [Line Items]
(Provision) benefit for income taxes			$ 62,100,000