Equity-Based Compensation Plans - Additional Information (Details) (USD $)	3 Months Ended	12 Months Ended			3 Months Ended		12 Months Ended					3 Months Ended	12 Months Ended					12 Months Ended			37 Months Ended
	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Mar. 31, 2012 Performance shares	Mar. 31, 2012 Restricted Stock Units (RSUs)	Dec. 31, 2012 Restricted Stock Units (RSUs)	Dec. 31, 2011 Restricted Stock Units (RSUs)	Dec. 31, 2010 Restricted Stock Units (RSUs)	Dec. 31, 2012 Restricted Stock Units (RSUs) Minimum	Dec. 31, 2012 Restricted Stock Units (RSUs) Maximum	Mar. 31, 2012 Performance shares	Dec. 31, 2012 Performance shares	Dec. 31, 2011 Performance shares	Dec. 31, 2010 Performance shares	Dec. 31, 2012 Performance shares Minimum	Dec. 31, 2012 Performance shares Maximum	Dec. 31, 2012 Director	Dec. 31, 2011 Director	Dec. 31, 2010 Director	Jan. 31, 2012 Director	Dec. 31, 2012 Cellu Tissue Holdings Inc
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Plan, effective date		Dec. 16, 2008
Stock Plan, shares authorized		4,100,000																				700,000
Shares deferred for future issuance (in shares)		1,900,000				175,654
Total fair value of share awards vested							$ 1,400,000
Unrecognized compensation costs							1,200,000						3,400,000
Unrecognized compensation costs, expected weighted-average period to be recognized (in years)							2 years 2 months 12 days						1 year 6 months
Percentage of amount subject to performance share award of number of shares actually issued																0.00%	200.00%
Settlement and distribution of shares issued (in shares)					499,680	112,682
Number of shares settled as percentage of outstanding amount					200.00%
Shares vested (in shares)						288,336	155,177	286,486	425,556				499,680	0	0
Share based compensation awards vesting period										1 year	3 years		3 years					1 year			3 years
Shares issued (in shares)	78,029											660,944
Cash paid for minimum tax withholdings		13,234,000	2,400,000	3,470,000			1,300,000					11,900,000
Share based compensation expense		8,334,000	6,658,000	4,819,000			970,000	1,212,000	1,544,000				7,364,000	5,446,000	3,275,000			1,400,000	1,500,000	3,700,000
Deferred compensation share-based arrangements, liability, classified, noncurrent																		$ 9,100,000	$ 7,700,000