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Available-For-Sale Securities Adjusted cost (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost $ 66,514,000 $ 58,997,000    
Unrealized Gains 1,442,000 942,000    
Unrealized Losses (263,000) (56,000)    
Accrued Interest 109,000 111,000    
Estimated Fair Value 67,802,000 59,994,000    
Cash & Cash Equivalents 36,382,000 39,937,000 14,262,000 17,165,000
Investment Securities 31,420,000 20,057,000    
Cash
        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 30,958,000 38,977,000    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Accrued Interest 0 0    
Estimated Fair Value 30,958,000 38,977,000    
Cash & Cash Equivalents 30,958,000 38,977,000    
Investment Securities 0 0    
Fair Value, Inputs, Level 1
        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 24,037,000 10,051,000    
Unrealized Gains 1,265,000 682,000    
Unrealized Losses (216,000) (50,000)    
Accrued Interest 26,000 34,000    
Estimated Fair Value 25,112,000 10,717,000    
Cash & Cash Equivalents 5,424,000 960,000    
Investment Securities 19,688,000 9,757,000    
Fair Value, Inputs, Level 1 | Money Market Accounts
        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 5,424,000 960,000    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Accrued Interest 0 0    
Estimated Fair Value 5,424,000 960,000    
Cash & Cash Equivalents 5,424,000 960,000    
Investment Securities 0 0    
Fair Value, Inputs, Level 1 | Mutual Funds
        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 7,887,000 234,000    
Unrealized Gains 127,000 13,000    
Unrealized Losses (164,000) (1,000)    
Accrued Interest 0 0    
Estimated Fair Value 7,850,000 246,000    
Cash & Cash Equivalents 0 0    
Investment Securities 7,850,000 246,000    
Fair Value, Inputs, Level 1 | Corporate Equity Securities
        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 4,614,000 1,853,000    
Unrealized Gains 1,076,000 489,000    
Unrealized Losses (9,000) (46,000)    
Accrued Interest 0 0    
Estimated Fair Value 5,681,000 2,296,000    
Cash & Cash Equivalents 0 0    
Investment Securities 5,681,000 2,296,000    
Fair Value, Inputs, Level 1 | Government Agency Securities
        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 6,112,000 7,004,000    
Unrealized Gains 62,000 180,000    
Unrealized Losses (43,000) (3,000)    
Accrued Interest 26,000 34,000    
Estimated Fair Value 6,157,000 7,215,000    
Cash & Cash Equivalents 0 0    
Investment Securities 6,157,000 7,215,000    
Fair Value, Inputs, Level 2
        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 11,519,000 9,969,000    
Unrealized Gains 177,000 260,000    
Unrealized Losses (47,000) (6,000)    
Accrued Interest 83,000 77,000    
Estimated Fair Value 11,732,000 10,300,000    
Cash & Cash Equivalents 0 0    
Investment Securities 11,732,000 10,300,000    
Fair Value, Inputs, Level 2 | Municipal Bonds
        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 3,524,000 4,197,000    
Unrealized Gains 103,000 124,000    
Unrealized Losses 0 (4,000)    
Accrued Interest 25,000 27,000    
Estimated Fair Value 3,652,000 4,344,000    
Cash & Cash Equivalents 0 0    
Investment Securities 3,652,000 4,344,000    
Fair Value, Inputs, Level 2 | Corporate Bond Securities
        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 7,995,000 5,772,000    
Unrealized Gains 74,000 136,000    
Unrealized Losses (47,000) (2,000)    
Accrued Interest 58,000 50,000    
Estimated Fair Value 8,080,000 5,956,000    
Cash & Cash Equivalents 0 0    
Investment Securities $ 8,080,000 $ 5,956,000