Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets
Federal net operating carryforward	$ 29,222	$ 32,201
State net operating loss carryforward	20,888	21,442
Impairment losses	146,358	147,467
Deferred compensation	1,118	1,092
Capitalized real estate taxes	8,124	7,781
Prepaid income on land sales	10,262	10,536
Other	3,397	4,229
Total gross deferred tax assets	219,369	224,748
Valuation allowance	(92,599)	(95,469)
Total net deferred tax assets	126,770	129,279
Deferred tax liabilities
Deferred gain on land sales and involuntary conversions	32,255	32,726
Prepaid pension asset	16,173	17,291
Installment sale	58,138	58,861
Depreciation	4,172	4,639
Other	4,075	4,047
Total gross deferred tax liabilities	114,813	117,564
Net deferred tax asset	$ 11,957	$ 11,715