Litigation and Environmental Contingencies - Environmental (Detail)	12 Months Ended
	Dec. 31, 2016 USD ($) a	Dec. 31, 2015 USD ($) a	Dec. 31, 2014 USD ($)
Environmental Exit Cost [Line Items]
Asset retirement obligation	$ 103,000	$ 1,758,000	$ 1,807,000
Antioch, California
Environmental Exit Cost [Line Items]
Area of land (in acres) | a	25	289
Area sold without certificate of completion under voluntary remediation program | a	80
Wyoming
Environmental Exit Cost [Line Items]
Environmental liability	$ 1,155,000
Paper Manufacturing Sites [Member]
Environmental Exit Cost [Line Items]
Insurance policy	$ 20,000,000
Length of insurance policy (in years)	10 years