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Earnings Per Share - Summary of Reconciliation of Numerators and Denominators Used in Basic and Diluted Per Share Computations (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Class A common stock [Member]
   
Numerator:    
Allocation of net (loss) income $ (510) $ 5,170
Denominator:    
Weighted-average shares outstanding 20,873,043 20,066,755
Basic net (loss) income per share $ (0.02) $ 0.26
Numerator:    
Allocation of net (loss) income (510) 5,170
Denominator:    
Number of shares used in basic computation 20,873,043 20,066,755
Weighted-average shares effect of dilutive securities    
Add: Director and employee stock options 380,186 291,477
Number of shares used in per share computations 21,253,229 20,358,232
Diluted net (loss) income per share $ (0.02) $ 0.25
Class B common stock [Member]
   
Numerator:    
Allocation of net (loss) income (124) 1,305
Denominator:    
Weighted-average shares outstanding 5,576,775 5,576,775
Basic net (loss) income per share $ (0.02) $ 0.23
Numerator:    
Allocation of net (loss) income $ (124) $ 1,305
Denominator:    
Number of shares used in basic computation 5,576,775 5,576,775
Weighted-average shares effect of dilutive securities    
Add: Director and employee stock options      
Number of shares used in per share computations 5,576,775 5,576,775
Diluted net (loss) income per share $ (0.02) $ 0.23