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Company's Demand Deposits and Temporary Cash Investments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Concentration Risk [Line Items]        
Deposits in FDIC and SIPC-insured institutions under insurance limits $ 289 $ 1,523    
Deposits in FDIC and SIPC-insured institutions over insurance limits 50,035 51,625    
Deposits in foreign banks 18,823 11,533    
Total Cash and cash equivalents., Total 69,147 64,681    
Less outstanding checks and other reconciling items (45,201) (37,069)    
Cash and cash equivalents $ 23,946 $ 27,612 $ 49,877 $ 81,223