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Available-For-Sale Securities Adjusted cost (Detail) (USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Cash and Cash Equivalents and Marketable Securites [Line Items]        
Cost $ 77,942,000 $ 58,997,000    
Unrealized Gains 650,000 942,000    
Unrealized Losses (590,000) (56,000)    
Accrued Interest 110,000 111,000    
Estimated Fair Value 78,112,000 59,994,000    
Cash & Cash Equivalents 44,405,000 39,937,000 37,120,000 14,262,000
Investment Securities 33,707,000 20,057,000    
Cash
        
Cash and Cash Equivalents and Marketable Securites [Line Items]        
Cost 42,531,000 38,977,000    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Accrued Interest 0 0    
Estimated Fair Value 42,531,000 38,977,000    
Cash & Cash Equivalents 42,531,000 38,977,000    
Investment Securities 0 0    
Fair Value, Inputs, Level 1
        
Cash and Cash Equivalents and Marketable Securites [Line Items]        
Cost 23,571,000 10,051,000    
Unrealized Gains 502,000 682,000    
Unrealized Losses (502,000) (50,000)    
Accrued Interest 29,000 34,000    
Estimated Fair Value 23,600,000 10,717,000    
Cash & Cash Equivalents 1,874,000 960,000    
Investment Securities 21,726,000 9,757,000    
Fair Value, Inputs, Level 1 | Money Market Accounts
        
Cash and Cash Equivalents and Marketable Securites [Line Items]        
Cost 1,874,000 960,000    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Accrued Interest 0 0    
Estimated Fair Value 1,874,000 960,000    
Cash & Cash Equivalents 1,874,000 960,000    
Investment Securities 0 0    
Fair Value, Inputs, Level 1 | Mutual Funds
        
Cash and Cash Equivalents and Marketable Securites [Line Items]        
Cost 9,361,000 234,000    
Unrealized Gains 16,000 13,000    
Unrealized Losses (242,000) (1,000)    
Accrued Interest 0 0    
Estimated Fair Value 9,135,000 246,000    
Cash & Cash Equivalents 0 0    
Investment Securities 9,135,000 246,000    
Fair Value, Inputs, Level 1 | Corporate Equity Securities
        
Cash and Cash Equivalents and Marketable Securites [Line Items]        
Cost 4,527,000 1,853,000    
Unrealized Gains 410,000 489,000    
Unrealized Losses (170,000) (46,000)    
Accrued Interest 0 0    
Estimated Fair Value 4,767,000 2,296,000    
Cash & Cash Equivalents 0 0    
Investment Securities 4,767,000 2,296,000    
Fair Value, Inputs, Level 1 | Government Agency Securities
        
Cash and Cash Equivalents and Marketable Securites [Line Items]        
Cost 7,809,000 7,004,000    
Unrealized Gains 76,000 180,000    
Unrealized Losses (90,000) (3,000)    
Accrued Interest 29,000 34,000    
Estimated Fair Value 7,824,000 7,215,000    
Cash & Cash Equivalents 0 0    
Investment Securities 7,824,000 7,215,000    
Fair Value, Inputs, Level 2
        
Cash and Cash Equivalents and Marketable Securites [Line Items]        
Cost 11,840,000 9,969,000    
Unrealized Gains 148,000 260,000    
Unrealized Losses (88,000) (6,000)    
Accrued Interest 81,000 77,000    
Estimated Fair Value 11,981,000 10,300,000    
Cash & Cash Equivalents 0 0    
Investment Securities 11,981,000 10,300,000    
Fair Value, Inputs, Level 2 | Municipal Bonds
        
Cash and Cash Equivalents and Marketable Securites [Line Items]        
Cost 3,629,000 4,197,000    
Unrealized Gains 88,000 124,000    
Unrealized Losses (1,000) (4,000)    
Accrued Interest 24,000 27,000    
Estimated Fair Value 3,740,000 4,344,000    
Cash & Cash Equivalents 0 0    
Investment Securities 3,740,000 4,344,000    
Fair Value, Inputs, Level 2 | Corporate Bond Securities
        
Cash and Cash Equivalents and Marketable Securites [Line Items]        
Cost 8,211,000 5,772,000    
Unrealized Gains 60,000 136,000    
Unrealized Losses (87,000) (2,000)    
Accrued Interest 57,000 50,000    
Estimated Fair Value 8,241,000 5,956,000    
Cash & Cash Equivalents 0 0    
Investment Securities $ 8,241,000 $ 5,956,000