Maturities of Debt (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2007
Debt Instrument [Line Items]
Long term debt	$ 36,062	[1]	$ 53,458
Defeased Debt
Debt Instrument [Line Items]
Long term debt	$ 26,818		$ 23,299	$ 29,300

[1] Includes debt defeased in connection with the sale of the Company's office portfolio in the amount of $26.8 million.