Summarized Balance Sheets for Unconsolidated Investments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Investment In Unconsolidated Affiliates [Line Items]
Other assets	$ 20,403		$ 21,981
Total assets	645,521		661,291
Total liabilities and equity	645,521		661,291
Other Affiliates
Investment In Unconsolidated Affiliates [Line Items]
Investment in real estate	12,381		12,355
Other assets	18,653		20,089
Total assets	31,034		32,444
Other liabilities	761		1,153
Equity	30,273	[1]	31,291	[1]
Total liabilities and equity	$ 31,034		$ 32,444

[1] The majority of the equity in unconsolidated investments relates to ALP Liquidating Trust ("The Trust). In 2008, the Company wrote-off its investment in the Trust as a result of the Trust reserving its assets to satisfy potential claims and obligations in accordance with its publicly reported liquidation basis of accounting. Subsequently, the Trust changed its method of accounting to a going concern basis and reinstated its equity and stated it would report certain expenses as they are incurred. The Company has not recorded any additional equity income as a result of the trust's change in accounting.