Timber Notes Non Recourse Debt - Additional Information (Detail) (USD $)	1 Months Ended					1 Months Ended	6 Months Ended	12 Months Ended			6 Months Ended		3 Months Ended		6 Months Ended					3 Months Ended
	Oct. 31, 2004	Dec. 31, 2004	Jun. 30, 2012 Timberland Assets	Oct. 31, 2004 Installment Notes Tranch One Year	Oct. 31, 2004 Installment Notes Tranch Two Year	Apr. 30, 2012 Installment Notes Lehman Brothers Holdings Inc	Jun. 30, 2012 Installment Notes Lehman Brothers Holdings Inc	Dec. 31, 2008 Installment Notes Lehman Brothers Holdings Inc	Sep. 30, 2008 Installment Notes Lehman Brothers Holdings Inc	Oct. 31, 2004 Installment Notes Lehman Brothers Holdings Inc	Jun. 30, 2012 Installment Notes Lehman Brothers Holdings Inc Minimum	Jun. 30, 2012 Installment Notes Lehman Brothers Holdings Inc Maximum	Jun. 30, 2012 Installment Notes Wachovia Corporation	Oct. 31, 2004 Installment Notes Wachovia Corporation	Jun. 30, 2012 Installment Notes Class Three Senior Unsecured Claim Lehman Brothers Holdings Inc	Dec. 31, 2004 Securitization Notes Tranch One Year	Dec. 31, 2004 Securitization Notes Tranch Two Year	Jun. 30, 2012 Securitization Notes Lehman Brothers Holdings Inc	Dec. 31, 2004 Securitization Notes Lehman Brothers Holdings Inc	Jun. 30, 2012 Securitization Notes Wachovia Corporation	Dec. 31, 2004 Securitization Notes Wachovia Corporation
Timber Notes/Non-Recourse Debt Receivable And Payable [Line Items]
Cash received from sale of timberland assets	$ 15,000,000
Timber notes receivable	1,635,000,000			817,500,000	817,500,000		81,800,000		81,800,000	817,500,000			817,500,000	817,500,000
Timber notes receivable - terms (in years)				15	15
Timber note receivables - interest rates				5.11%	4.98%
Timber securitization notes		1,470,000,000														735,000,000	735,000,000	735,000,000	735,000,000		735,000,000
Cash received from the securitization of timber notes		1,470,000,000
Timber securitization notes - terms (in years)																15	15
Timber securitization notes - interest rates																5.54%	5.42%
Timber notes receivable defaulted as result of Lehman bankruptcy									817,500,000
Non-cash impairment charge pre-tax								735,800,000
Percentage of claim recovery rate											17.00%	20.00%			21.10%
Distribution received from Lehman bankruptcy						50,000,000	50,000,000
Timber securitization notes, interest payable																		17,900,000
Timberlands asset sale deferred tax liability			$ 529,000,000
Timber notes receivable - maturity year													2020
Timber securitization notes - maturity year																				2019