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Stockholders' Equity - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended
Dec. 07, 2012
Sep. 30, 2013
Sep. 30, 2012
Stockholders Equity [Line Items]      
Cash dividend declared monthly (per share)   $ 0.005  
Stock repurchase program, authorized amount $ 2,750,000    
Payments for repurchase of common stock   37,209  
Remaining authorized repurchase amount   2,539,000  
Stock-based compensation expense   610 7,710
Unrecognized share-based compensation cost   7,117 9,557
Number of Options, Options outstanding   29,000  
Weighted Average Exercise Price, Options outstanding   $ 17.03  
Number of Options, Options exercisable   26,000  
Weighted Average Exercise Price, Options exercisable   $ 18.25  
Common Class A [Member]
      
Stockholders Equity [Line Items]      
Number of shares repurchased   13,219  
Payments for repurchase of common stock   $ 37,209