XML 33 R73.htm IDEA: XBRL DOCUMENT v2.4.0.8
Stock Compensation Plans - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
May 31, 2013
Dec. 31, 2013
Minimum [Member]
Dec. 31, 2013
Maximum [Member]
Dec. 31, 2013
Restricted Stock Award [Member]
Dec. 31, 2013
2009 Employee Stock Purchase Plan [Member]
Dec. 31, 2012
2009 Employee Stock Purchase Plan [Member]
Dec. 31, 2013
Performance Based Compensation [Member]
Dec. 31, 2013
Common Class A [Member]
Dec. 31, 2013
Common Class A [Member]
1996 Equity Incentive Plan [Member]
Dec. 31, 2013
Common Class A [Member]
2009 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Shares reserved for issuance to directors and employees   2,500,000               15,500,000  
Expiration date of options granted under equity incentive plan         10 years            
Award vesting period     3 years 5 years              
Award vesting terms Vesting terms ranging from three to five years which primarily includes 1) options that vest in one-fifth increments beginning on the grant date and continuing on each of the first four anniversaries of the grant date and 2) options that cliff-vest on the fifth anniversary of the grant date.                    
Accrued expenses, liability $ 6,757                    
Period of graded vesting for option valuation 4 years                    
Period of cliff vesting for option valuation 5 years                    
Expected Volatility                 75.00%    
Volatility rate on publicly traded options                 25.00%    
Total unrecognized compensation cost related to nonvested awards 24,107                    
Weighted average number of years over which compensation cost related to nonvested awards is expected to be recognized 2 years                    
Shares available for future stock option and restricted share grants to employees and directors under existing plans 2,797,768         327,689 358,950        
Aggregate intrinsic value of options outstanding 62,609                    
Aggregate intrinsic value of options exercisable 47,085                    
Total intrinsic value of options exercised 15,362                    
New employee stock purchase plan, which reserved additional shares of common stock                     588,154
Employee stock purchase plan, which available for issuance of common stock                     88,154
Additional shares reserved under 2009 ESPP           78,963         78,963
Range of awards of target number of share     0.00% 100.00%              
Compensation expense related to performance based compensation agreements               $ 7,231