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Available-For-Sale Securities Adjusted cost (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost $ 71,657 $ 67,237    
Unrealized Gains 442 372    
Unrealized Losses (519) (583)    
Accrued Interest 69 83    
Estimated Fair Value 71,649 67,109    
Cash & Cash Equivalents 47,316 42,037 $ 33,424 $ 24,459
Investment Securities 24,333 25,072    
Cash        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 46,412 38,276    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Accrued Interest 0 0    
Estimated Fair Value 46,412 38,276    
Cash & Cash Equivalents 46,412 38,276    
Investment Securities 0 0    
Fair Value, Inputs, Level 1        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 16,781 20,172    
Unrealized Gains 320 308    
Unrealized Losses (504) (539)    
Accrued Interest 15 17    
Estimated Fair Value 16,612 19,958    
Cash & Cash Equivalents 904 3,761    
Investment Securities 15,708 16,197    
Fair Value, Inputs, Level 1 | Money Market Accounts        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 904 3,761    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Accrued Interest 0 0    
Estimated Fair Value 904 3,761    
Cash & Cash Equivalents 904 3,761    
Investment Securities 0 0    
Fair Value, Inputs, Level 1 | Mutual Funds        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 9,640 9,654    
Unrealized Gains 23 37    
Unrealized Losses (478) (444)    
Accrued Interest 0 0    
Estimated Fair Value 9,185 9,247    
Cash & Cash Equivalents 0 0    
Investment Securities 9,185 9,247    
Fair Value, Inputs, Level 1 | Corporate Equity Securities        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 1,517 1,332    
Unrealized Gains 233 246    
Unrealized Losses (25) (76)    
Accrued Interest 0 0    
Estimated Fair Value 1,725 1,502    
Cash & Cash Equivalents 0 0    
Investment Securities 1,725 1,502    
Fair Value, Inputs, Level 1 | Government & Agency Securities        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 4,720 5,425    
Unrealized Gains 64 25    
Unrealized Losses (1) (19)    
Accrued Interest 15 17    
Estimated Fair Value 4,798 5,448    
Cash & Cash Equivalents 0 0    
Investment Securities 4,798 5,448    
Fair Value, Inputs, Level 2        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 8,464 8,789    
Unrealized Gains 122 64    
Unrealized Losses (15) (44)    
Accrued Interest 54 66    
Estimated Fair Value 8,625 8,875    
Cash & Cash Equivalents 0 0    
Investment Securities 8,625 8,875    
Fair Value, Inputs, Level 2 | Municipal Bonds        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 2,732 2,735    
Unrealized Gains 39 42    
Unrealized Losses (3) (3)    
Accrued Interest 16 20    
Estimated Fair Value 2,784 2,794    
Cash & Cash Equivalents 0 0    
Investment Securities 2,784 2,794    
Fair Value, Inputs, Level 2 | Corporate Bonds        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 5,732 6,054    
Unrealized Gains 83 22    
Unrealized Losses (12) (41)    
Accrued Interest 38 46    
Estimated Fair Value 5,841 6,081    
Cash & Cash Equivalents 0 0    
Investment Securities $ 5,841 $ 6,081