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Available-For-Sale Securities Adjusted cost (Detail) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Cash and Cash Equivalents and Marketable Securites [Line Items]        
Cost $ 67,884,000 $ 58,997,000    
Unrealized Gains 967,000 942,000    
Unrealized Losses (52,000) (56,000)    
Accrued Interest 100,000 111,000    
Estimated Fair Value 68,899,000 59,994,000    
Cash & Cash Equivalents 49,230,000 39,937,000 31,935,000 14,262,000
Investment Securities 19,669,000 20,057,000    
Cash
        
Cash and Cash Equivalents and Marketable Securites [Line Items]        
Cost 47,711,000 38,977,000    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Accrued Interest 0 0    
Estimated Fair Value 47,711,000 38,977,000    
Cash & Cash Equivalents 47,711,000 38,977,000    
Investment Securities 0 0    
Fair Value, Inputs, Level 1
        
Cash and Cash Equivalents and Marketable Securites [Line Items]        
Cost 10,690,000 10,051,000    
Unrealized Gains 729,000 682,000    
Unrealized Losses (51,000) (50,000)    
Accrued Interest 30,000 34,000    
Estimated Fair Value 11,398,000 10,717,000    
Cash & Cash Equivalents 1,519,000 960,000    
Investment Securities 9,879,000 9,757,000    
Fair Value, Inputs, Level 1 | Money Market Accounts
        
Cash and Cash Equivalents and Marketable Securites [Line Items]        
Cost 1,519,000 960,000    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Accrued Interest 0 0    
Estimated Fair Value 1,519,000 960,000    
Cash & Cash Equivalents 1,519,000 960,000    
Investment Securities 0 0    
Fair Value, Inputs, Level 1 | Mutual Funds
        
Cash and Cash Equivalents and Marketable Securites [Line Items]        
Cost 1,067,000 234,000    
Unrealized Gains 19,000 13,000    
Unrealized Losses (4,000) (1,000)    
Accrued Interest 0 0    
Estimated Fair Value 1,082,000 246,000    
Cash & Cash Equivalents 0 0    
Investment Securities 1,082,000 246,000    
Fair Value, Inputs, Level 1 | Corporate Equity Securities
        
Cash and Cash Equivalents and Marketable Securites [Line Items]        
Cost 1,767,000 1,853,000    
Unrealized Gains 550,000 489,000    
Unrealized Losses (45,000) (46,000)    
Accrued Interest 0 0    
Estimated Fair Value 2,272,000 2,296,000    
Cash & Cash Equivalents 0 0    
Investment Securities 2,272,000 2,296,000    
Fair Value, Inputs, Level 1 | Government Agency Securities
        
Cash and Cash Equivalents and Marketable Securites [Line Items]        
Cost 6,337,000 7,004,000    
Unrealized Gains 160,000 180,000    
Unrealized Losses (2,000) (3,000)    
Accrued Interest 30,000 34,000    
Estimated Fair Value 6,525,000 7,215,000    
Cash & Cash Equivalents 0 0    
Investment Securities 6,525,000 7,215,000    
Fair Value, Inputs, Level 2
        
Cash and Cash Equivalents and Marketable Securites [Line Items]        
Cost 9,483,000 9,969,000    
Unrealized Gains 238,000 260,000    
Unrealized Losses (1,000) (6,000)    
Accrued Interest 70,000 77,000    
Estimated Fair Value 9,790,000 10,300,000    
Cash & Cash Equivalents 0 0    
Investment Securities 9,790,000 10,300,000    
Fair Value, Inputs, Level 2 | Municipal Bonds
        
Cash and Cash Equivalents and Marketable Securites [Line Items]        
Cost 3,634,000 4,197,000    
Unrealized Gains 127,000 124,000    
Unrealized Losses 0 (4,000)    
Accrued Interest 21,000 27,000    
Estimated Fair Value 3,782,000 4,344,000    
Cash & Cash Equivalents 0 0    
Investment Securities 3,782,000 4,344,000    
Fair Value, Inputs, Level 2 | Corporate Bond Securities
        
Cash and Cash Equivalents and Marketable Securites [Line Items]        
Cost 5,849,000 5,772,000    
Unrealized Gains 111,000 136,000    
Unrealized Losses (1,000) (2,000)    
Accrued Interest 49,000 50,000    
Estimated Fair Value 6,008,000 5,956,000    
Cash & Cash Equivalents 0 0    
Investment Securities $ 6,008,000 $ 5,956,000