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Available-For-Sale Securities Adjusted cost (Detail) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
Cash and Cash Equivalents and Marketable Securites [Line Items]        
Cost $ 81,401,000 $ 58,997,000    
Unrealized Gains 975,000 942,000    
Unrealized Losses (475,000) (56,000)    
Accrued Interest 107,000 111,000    
Estimated Fair Value 82,008,000 59,994,000    
Cash & Cash Equivalents 47,980,000 39,937,000 43,411,000 14,262,000
Investment Securities 34,028,000 20,057,000    
Cash
        
Cash and Cash Equivalents and Marketable Securites [Line Items]        
Cost 45,816,000 38,977,000    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Accrued Interest 0 0    
Estimated Fair Value 45,816,000 38,977,000    
Cash & Cash Equivalents 45,816,000 38,977,000    
Investment Securities 0 0    
Fair Value, Inputs, Level 1
        
Cash and Cash Equivalents and Marketable Securites [Line Items]        
Cost 23,949,000 10,051,000    
Unrealized Gains 803,000 682,000    
Unrealized Losses (418,000) (50,000)    
Accrued Interest 31,000 34,000    
Estimated Fair Value 24,365,000 10,717,000    
Cash & Cash Equivalents 2,164,000 960,000    
Investment Securities 22,201,000 9,757,000    
Fair Value, Inputs, Level 1 | Money Market Accounts
        
Cash and Cash Equivalents and Marketable Securites [Line Items]        
Cost 2,164,000 960,000    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Accrued Interest 0 0    
Estimated Fair Value 2,164,000 960,000    
Cash & Cash Equivalents 2,164,000 960,000    
Investment Securities 0 0    
Fair Value, Inputs, Level 1 | Mutual Funds
        
Cash and Cash Equivalents and Marketable Securites [Line Items]        
Cost 9,426,000 234,000    
Unrealized Gains 52,000 13,000    
Unrealized Losses (244,000) (1,000)    
Accrued Interest 0 0    
Estimated Fair Value 9,234,000 246,000    
Cash & Cash Equivalents 0 0    
Investment Securities 9,234,000 246,000    
Fair Value, Inputs, Level 1 | Corporate Equity Securities
        
Cash and Cash Equivalents and Marketable Securites [Line Items]        
Cost 4,585,000 1,853,000    
Unrealized Gains 668,000 489,000    
Unrealized Losses (98,000) (46,000)    
Accrued Interest 0 0    
Estimated Fair Value 5,155,000 2,296,000    
Cash & Cash Equivalents 0 0    
Investment Securities 5,155,000 2,296,000    
Fair Value, Inputs, Level 1 | Government Agency Securities
        
Cash and Cash Equivalents and Marketable Securites [Line Items]        
Cost 7,774,000 7,004,000    
Unrealized Gains 83,000 180,000    
Unrealized Losses (76,000) (3,000)    
Accrued Interest 31,000 34,000    
Estimated Fair Value 7,812,000 7,215,000    
Cash & Cash Equivalents 0 0    
Investment Securities 7,812,000 7,215,000    
Fair Value, Inputs, Level 2
        
Cash and Cash Equivalents and Marketable Securites [Line Items]        
Cost 11,636,000 9,969,000    
Unrealized Gains 172,000 260,000    
Unrealized Losses (57,000) (6,000)    
Accrued Interest 76,000 77,000    
Estimated Fair Value 11,827,000 10,300,000    
Cash & Cash Equivalents 0 0    
Investment Securities 11,827,000 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 99,000 124,000    
Unrealized Losses 0 (4,000)    
Accrued Interest 23,000 27,000    
Estimated Fair Value 3,751,000 4,344,000    
Cash & Cash Equivalents 0 0    
Investment Securities 3,751,000 4,344,000    
Fair Value, Inputs, Level 2 | Corporate Bond Securities
        
Cash and Cash Equivalents and Marketable Securites [Line Items]        
Cost 8,007,000 5,772,000    
Unrealized Gains 73,000 136,000    
Unrealized Losses (57,000) (2,000)    
Accrued Interest 53,000 50,000    
Estimated Fair Value 8,076,000 5,956,000    
Cash & Cash Equivalents 0 0    
Investment Securities $ 8,076,000 $ 5,956,000