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Company's Demand Deposits And Temporary Cash Investments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Concentration Risk [Line Items]        
Deposits in FDIC and SIPC-insured institutions under insurance limits $ 270 $ 289    
Deposits in FDIC and SIPC-insured institutions over insurance limits 161,195 50,035    
Deposits in foreign banks 22,511 18,823    
Total Cash and cash equivalents., Total 183,976 69,147    
Less outstanding checks and other reconciling items (73,253) (45,201)    
Cash and cash equivalents $ 110,723 $ 23,946 $ 27,612 $ 49,877