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Available-For-Sale Securities Adjusted cost (Detail) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost $ 76,055,000 $ 66,514,000    
Unrealized Gains 1,389,000 1,442,000    
Unrealized Losses (190,000) (263,000)    
Accrued Interest 106,000 109,000    
Estimated Fair Value 77,360,000 67,802,000    
Cash & Cash Equivalents 41,360,000 36,382,000 49,230,000 39,937,000
Investment Securities 36,000,000 31,420,000    
Cash
        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 40,262,000 30,958,000    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Accrued Interest 0 0    
Estimated Fair Value 40,262,000 30,958,000    
Cash & Cash Equivalents 40,262,000 30,958,000    
Investment Securities 0 0    
Fair Value, Inputs, Level 1
        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 23,600,000 24,037,000    
Unrealized Gains 1,207,000 1,265,000    
Unrealized Losses (155,000) (216,000)    
Accrued Interest 28,000 26,000    
Estimated Fair Value 24,680,000 25,112,000    
Cash & Cash Equivalents 1,098,000 5,424,000    
Investment Securities 23,582,000 19,688,000    
Fair Value, Inputs, Level 1 | Money Market Accounts
        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 1,098,000 5,424,000    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Accrued Interest 0 0    
Estimated Fair Value 1,098,000 5,424,000    
Cash & Cash Equivalents 1,098,000 5,424,000    
Investment Securities 0 0    
Fair Value, Inputs, Level 1 | Mutual Funds
        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 10,367,000 7,887,000    
Unrealized Gains 120,000 127,000    
Unrealized Losses (51,000) (164,000)    
Accrued Interest 0 0    
Estimated Fair Value 10,436,000 7,850,000    
Cash & Cash Equivalents 0 0    
Investment Securities 10,436,000 7,850,000    
Fair Value, Inputs, Level 1 | Corporate Equity Securities
        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 4,740,000 4,614,000    
Unrealized Gains 1,022,000 1,076,000    
Unrealized Losses (64,000) (9,000)    
Accrued Interest 0 0    
Estimated Fair Value 5,698,000 5,681,000    
Cash & Cash Equivalents 0 0    
Investment Securities 5,698,000 5,681,000    
Fair Value, Inputs, Level 1 | Government Agency Securities
        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 7,395,000 6,112,000    
Unrealized Gains 65,000 62,000    
Unrealized Losses (40,000) (43,000)    
Accrued Interest 28,000 26,000    
Estimated Fair Value 7,448,000 6,157,000    
Cash & Cash Equivalents 0 0    
Investment Securities 7,448,000 6,157,000    
Fair Value, Inputs, Level 2
        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 12,193,000 11,519,000    
Unrealized Gains 182,000 177,000    
Unrealized Losses (35,000) (47,000)    
Accrued Interest 78,000 83,000    
Estimated Fair Value 12,418,000 11,732,000    
Cash & Cash Equivalents 0 0    
Investment Securities 12,418,000 11,732,000    
Fair Value, Inputs, Level 2 | Municipal Bonds
        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 4,419,000 3,524,000    
Unrealized Gains 101,000 103,000    
Unrealized Losses (6,000) 0    
Accrued Interest 27,000 25,000    
Estimated Fair Value 4,541,000 3,652,000    
Cash & Cash Equivalents 0 0    
Investment Securities 4,541,000 3,652,000    
Fair Value, Inputs, Level 2 | Corporate Bonds
        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 7,774,000 7,995,000    
Unrealized Gains 81,000 74,000    
Unrealized Losses (29,000) (47,000)    
Accrued Interest 51,000 58,000    
Estimated Fair Value 7,877,000 8,080,000    
Cash & Cash Equivalents 0 0    
Investment Securities $ 7,877,000 $ 8,080,000