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Transactions With Related Parties - Additional Information (Detail) - USD ($) $ in Millions	2 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Carrying amount of LTP's assets		$ 4.5	$ 5.2
Carrying amount of LTP's liabilities		$ 4.5	5.2
Boise Cascade Co-Owner of LTP
Related Party Transaction [Line Items]
Variable interest entity, ownership percentage		50.00%
Boise Cascade Co-Owner of LTP \| Fiber
Related Party Transaction [Line Items]
Revenue from Related Parties	$ 10.3	$ 88.8	75.8
Fiber Costs From Related Parties		$ 20.7	$ 28.7	$ 3.7
Packaging Corporation of America
Related Party Transaction [Line Items]
Variable interest entity, ownership percentage		50.00%