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Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating Loss Carryforwards [Line Items]        
Retroactive tax relief $ 500,000      
Alternative minimum tax (ATM) remaining state tax NOL carryforwards 22,000,000      
Current period excess stock-based compensation tax deduction 0 500,000 1,300,000  
Unrecognized federal and state tax benefits 2,409,000 2,292,000 709,000 700,000
Net unrecognized tax benefits 204,000 236,000 461,000  
Interest and penalties associated with unrecognized tax benefits 121,000 430,000 42,000  
Interest and penalties accrued 585,000 464,000    
State and Local Jurisdiction [Member]
        
Operating Loss Carryforwards [Line Items]        
State NOL carryforwards 100,000 100,000 200,000  
Alternative minimum tax (ATM) remaining state tax NOL carryforwards   43,600,000    
Portion of state NOL carryforwards, not able to be utilized before expiration 8,300,000 6,800,000 6,900,000  
Federal benefit 300,000 300,000 300,000  
Deferred tax assets, operating loss carryforwad, excess tax benefits 1,000,000      
Internal Revenue Service (IRS) [Member]
        
Operating Loss Carryforwards [Line Items]        
Gross tax credits 905,000      
Tax carryforward period 20 years      
Alternative minimum tax (ATM) remaining state tax NOL carryforwards 29,900,000      
Deferred tax assets, operating loss carryforwad, excess tax benefits 1,400,000      
Federal And State Tax [Member]
        
Operating Loss Carryforwards [Line Items]        
Unrecognized federal and state tax benefits $ 500,000 $ 0