Summary of Notes Payable (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Debt Instrument [Line Items]
Banks - primarily secured, varying payments and rates	$ 6,031	[1]	$ 7,863	[1]
Other than banks	450		3,859
Loans Payable, Total	$ 6,481		$ 11,722

[1] Average interest rates were 3.07% and 3.49% at December 31, 2012 and 2011, respectively.