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Shareholders' Equity - Additional Information (Detail) (USD $)
 0 Months Ended 12 Months Ended
Aug. 13, 2012
Dec. 31, 2013
Dec. 31, 2012
Class of Stock [Line Items]      
Issuance of common stock Dividend Reinvestment Plan 750,000    
Number of stock option granted   923,000 163,000
Number of stock awards granted   0 0
Share-based compensation expense   $ 1,100,000 $ 700,000
Equity compensation expense capitalized in inventory or fixed assets   0  
Employees offering dates intervals   6 months  
Employee stock purchase plan expense   19,000 16,000
Contributions to the employees' stock ownership trust in cash   0 0
Contributions to the employees' stock ownership trust in shares   0 0
Weighted-average fair value of stock options granted   $ 6.18 $ 3.81
Expected Volatility Rate     60.00%
Expected Term Period     6 years 2 months 12 days
Risk-Free Interest Rate Minimum   1.20%  
Risk-Free Interest Rate Maximum   2.30%  
Risk-Free Interest Rate     1.20%
Expected dividend rate     1.90%
Cash received from employee stock option exercised   1,400,000 200,000
Intrinsic value of option exercised   2,700,000 100,000
Warrants issued to acquire Icarus Share   250,000  
Warrants exercise price   9.07  
Warrants expiration date   Dec. 26, 2016  
Share purchased   180,000 63,000
Market price per share   $ 13.14  
Aggregate value transaction value of share purchased   2,365,000 456,000
Stock repurchase program, amount authorized to be repurchased     500,000
Stock repurchase program, period over which shares may be repurchased     18 months
Conversion of debt to equity     9,600,000
Common stock outstanding owned by certain controlling interests, minimum     10.00%
Convertible Promissory Notes [Member]
      
Class of Stock [Line Items]      
Conversion of debt to equity     9,600,000
Common Stock [Member]
      
Class of Stock [Line Items]      
Share purchased   180,000 63,000
Aggregate value transaction value of share purchased   $ 2,000  
Conversion of debt to equity, Shares     2,400,000
Minimum [Member]
      
Class of Stock [Line Items]      
Expected Volatility Rate   57.00%  
Expected Term Period   6 years  
Expected dividend rate   1.50%  
Maximum [Member]
      
Class of Stock [Line Items]      
Expected Volatility Rate   58.00%  
Expected Term Period   6 years 6 months  
Expected dividend rate   1.70%  
2007 Plan [Member]
      
Class of Stock [Line Items]      
Number of stock option granted   923,000  
Number of shares reserved for issuance   2,600,000  
Shares available for future grant   474,000  
1997 Plan [Member]
      
Class of Stock [Line Items]      
Number of shares reserved for issuance   1,500,000  
Shares available for future grant   1,036,000  
Non Employee Stock Option [Member] | 2007 Plan [Member] | Minimum [Member]
      
Class of Stock [Line Items]      
2007 stock options or stock awards, vesting period   1 year  
Non Employee Stock Option [Member] | 2007 Plan [Member] | Maximum [Member]
      
Class of Stock [Line Items]      
2007 stock options or stock awards, vesting period   3 years  
Employee Stock Option [Member] | 2007 Plan [Member] | Minimum [Member]
      
Class of Stock [Line Items]      
2007 stock options or stock awards, vesting period   3 years  
Employee Stock Option [Member] | 2007 Plan [Member] | Maximum [Member]
      
Class of Stock [Line Items]      
2007 stock options or stock awards, vesting period   5 years  
Employee Stock Option [Member] | Awards Subject to Service Requirements [Member] | Maximum [Member]
      
Class of Stock [Line Items]      
2007 stock options or stock awards, vesting period   3 years  
Performance Shares [Member]
      
Class of Stock [Line Items]      
Number of performance-based awards outstanding   0 0
Employee Stock Purchase Plan [Member]
      
Class of Stock [Line Items]      
Number of shares authorized in employee stock purchase plan   1,500,000  
Employee stock purchase plan period   10 years  
Discount from market price   15.00%