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Computation of Net Income Per Share Basic and Diluted (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Numerator:    
Net income from continuing operations $ 846 $ 116
Dividends paid to participating securities (36)  
Class A
    
Numerator:    
Net income from continuing operations 170 30
Net income from continuing operations applicable to common stockholders 170 30
Discontinued operations, net of tax 2 (9)
Net income applicable to common stockholders 172 21
Net income from continuing operations 170 30
Net income from continuing operations applicable to common stockholders 170 30
Discontinued operations, net of tax 2 (9)
Discontinued operations, net of tax 2 (9)
Net income applicable to common stockholders 172 21
Denominator:    
Weighted average number of shares outstanding used to calculate basic net income per share 7,741 9,570
Weighted average number of shares outstanding used to calculate diluted net income per share 7,741 9,570
Basic net income per share:    
Net income from continuing operations applicable to common stockholders $ 0.02 $ 0.00
Discontinued operations, net of tax $ 0.00 $ 0.00
Basic net income per share applicable to common stockholders $ 0.02 $ 0.00
Diluted net income per share:    
Net income from continuing operations applicable to common stockholders $ 0.02 $ 0.00
Discontinued operations, net of tax $ 0.00 $ 0.00
Diluted net income per share applicable to common stockholders $ 0.02 $ 0.00
Class B
    
Numerator:    
Net income from continuing operations 676 86
Dividends paid to participating securities (36)  
Net income from continuing operations applicable to common stockholders 640 86
Discontinued operations, net of tax 7 (22)
Net income applicable to common stockholders 647 64
Net income from continuing operations 676 86
Reallocation of discontinued operations for Class A shares as a result of conversion of Class A to Class B shares 170 30
Net income from continuing operations applicable to common stockholders 810 116
Discontinued operations, net of tax 7 (22)
Discontinued operations, net of tax 9 (31)
Net income applicable to common stockholders 819 85
Denominator:    
Weighted average number of shares outstanding used to calculate basic net income per share 29,035 25,585
Weighted average stock options and common shares subject to repurchase or cancellation 2,985 395
Conversion of Class A to Class B common shares outstanding 7,741 9,570
Weighted average number of shares outstanding used to calculate diluted net income per share 39,761 35,550
Basic net income per share:    
Net income from continuing operations applicable to common stockholders $ 0.02 $ 0.00
Discontinued operations, net of tax $ 0.00 $ 0.00
Basic net income per share applicable to common stockholders $ 0.02 $ 0.00
Diluted net income per share:    
Net income from continuing operations applicable to common stockholders $ 0.02 $ 0.00
Discontinued operations, net of tax $ 0.00 $ 0.00
Diluted net income per share applicable to common stockholders $ 0.02 $ 0.00
Class B | Discontinued Operations
    
Numerator:    
Reallocation of discontinued operations for Class A shares as a result of conversion of Class A to Class B shares $ 2 $ (9)