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Stock-based Compensation - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 21 Months Ended
Feb. 28, 2014
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Sep. 30, 2014
Jun. 30, 2015
Stock-Based Compensation Activity [Line Items]                
Unrecognized compensation costs related to non-vested awards   $ 2,400,000     $ 2,400,000     $ 2,400,000
Weighted average period for recognition of compensation costs related to non-vested awards         2 years 1 month 6 days      
Performance share awards fully expensed   $ 400,000     $ 400,000     400,000
Weighted average per share fair value of stock options   $ 8.85   $ 8.69 $ 7.25 $ 8.72    
Dividend yield   0.00%   0.00% 0.00% 0.00%    
Total pre-tax intrinsic value of options exercised   $ 300,000   $ 200,000 $ 1,700,000 $ 1,300,000    
Stock option related expense       600,000   600,000    
Performance Shares, time period         3 years      
Stock compensation expenses recognized   629,000   580,000 $ 1,841,000 3,043,000    
Former Chairman of the Board [Member]                
Stock-Based Compensation Activity [Line Items]                
Restricted stock expense $ 200,000              
Fiscal 2015 (2015 - 2017) [Member]                
Stock-Based Compensation Activity [Line Items]                
Performance period start year         2015      
Performance period end year         2017      
Fiscal 2014 (2014 - 2016) [Member]                
Stock-Based Compensation Activity [Line Items]                
Performance period start year         2014      
Performance period end year         2016      
Fiscal 2013 (2013 - 2015) [Member]                
Stock-Based Compensation Activity [Line Items]                
Performance period start year         2013      
Performance period end year         2015      
Fiscal 2012 (2012 - 2014) [Member]                
Stock-Based Compensation Activity [Line Items]                
Performance period start year         2012      
Performance period end year         2014      
Maximum [Member]                
Stock-Based Compensation Activity [Line Items]                
Restricted stock expense   100,000   100,000 $ 200,000 200,000    
Expense recognized related to Performance Shares   200,000   200,000 500,000 700,000    
Maximum [Member] | 2009 Equity Incentive Plan [Member]                
Stock-Based Compensation Activity [Line Items]                
Stock compensation expenses recognized   100,000   100,000 $ 100,000 100,000    
Nonqualified Stock Options [Member]                
Stock-Based Compensation Activity [Line Items]                
Vesting terms         Non-qualified stock options generally become exercisable with respect to 25% of the shares on each of the first four anniversaries following the grant date.      
Nonqualified Stock Options [Member] | Board of Director [Member]                
Stock-Based Compensation Activity [Line Items]                
Stock option exercisable on a pro-rata basis         1 year      
Nonqualified Stock Options [Member] | Minimum [Member] | Board of Director [Member]                
Stock-Based Compensation Activity [Line Items]                
Stock option expiration term upon expiration of employment or service         7 years      
Nonqualified Stock Options [Member] | Maximum [Member] | Board of Director [Member]                
Stock-Based Compensation Activity [Line Items]                
Stock option expiration term upon expiration of employment or service         10 years      
Performance Shares [Member]                
Stock-Based Compensation Activity [Line Items]                
Issuance of shares     98,093          
Performance Shares [Member] | Fiscal 2015 (2015 - 2017) [Member]                
Stock-Based Compensation Activity [Line Items]                
Fair value of performance shares for grants awarded         $ 900,000      
Performance Shares [Member] | Fiscal 2014 (2014 - 2016) [Member]                
Stock-Based Compensation Activity [Line Items]                
Fair value of performance shares for grants awarded         900,000      
Performance Shares [Member] | Fiscal 2013 (2013 - 2015) [Member]                
Stock-Based Compensation Activity [Line Items]                
Fair value of performance shares for grants awarded         900,000      
Performance Shares [Member] | Maximum [Member]                
Stock-Based Compensation Activity [Line Items]                
Issuance of shares     124,994          
1999 Employee Stock Purchase Plan [Member]                
Stock-Based Compensation Activity [Line Items]                
Annual compensation withheld, maximum limit         25,000      
Employee contributions   100,000     $ 100,000     $ 100,000
1999 Employee Stock Purchase Plan [Member] | Maximum [Member]                
Stock-Based Compensation Activity [Line Items]                
Common stock authorized, shares         400,000      
Annual compensation withheld         10.00%      
Employee contributions       100,000   100,000    
Stock compensation expenses recognized   $ 100,000   100,000 $ 100,000 100,000    
Restricted Stock Units (RSUs) [Member] | 2009 Equity Incentive Plan [Member]                
Stock-Based Compensation Activity [Line Items]                
Stock compensation expenses recognized       100,000   300,000    
Number of stock units awarded         10,678     35,512
Number of stock units forfeited   0     3,068   3,417  
Number of stock units issued   0     7,681   2,183  
Additional Stock-based compensation expenses       $ 200,000   $ 200,000    
Restricted Stock Units (RSUs) [Member] | Maximum [Member] | 2009 Equity Incentive Plan [Member]                
Stock-Based Compensation Activity [Line Items]                
Stock compensation expenses recognized   $ 100,000     $ 200,000      
Deferred Stock Units [Member] | Director [Member]                
Stock-Based Compensation Activity [Line Items]                
Number of stock units awarded   1,547            
Deferred Stock Units [Member] | 2009 Equity Incentive Plan [Member] | Director [Member]                
Stock-Based Compensation Activity [Line Items]                
Number of stock units awarded         4,433      
Number of deferred stock units issued fair value         $ 100,000      
Deferred Stock Units [Member] | Maximum [Member] | 2009 Equity Incentive Plan [Member] | Director [Member]                
Stock-Based Compensation Activity [Line Items]                
Number of deferred stock units issued fair value   $ 100,000            
Vesting Anniversary [Member] | Nonqualified Stock Options [Member]                
Stock-Based Compensation Activity [Line Items]                
Performance share awards, estimated vesting percentage         25.00%      
Performance Level [Member] | Minimum [Member]                
Stock-Based Compensation Activity [Line Items]                
Performance share awards, estimated vesting percentage         20.00%      
Performance Level [Member] | Maximum [Member]                
Stock-Based Compensation Activity [Line Items]                
Performance share awards, estimated vesting percentage         200.00%