v2.4.0.8
Employee Savings Plan - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Defined Contribution Plans Disclosure [Line Items]        
401(k) eligibility minimum service period     90 days  
401(k) description of plan contributions     Contribution equal to 100% of the first 1% of salary deferrals and 50% of salary deferrals between 2% and 6%, up to a maximum of 3.5% of salary each plan year for our employees  
Employee vested percentage in salary deferrals and roll over contributions     100.00%  
Minimum period for vesting 100% contributions     2 years  
Discretionary contributions vested period     6 years  
Matching contribution amount $ 0.4 $ 0.2 $ 0.9 $ 0.6
100% Match for Percent of Participants Contribution [Member]
       
Defined Contribution Plans Disclosure [Line Items]        
Employer contribution percentage     100.00%  
Percentage of salary deferrals     1.00%  
50% Matching Contribution [Member]
       
Defined Contribution Plans Disclosure [Line Items]        
Employer contribution percentage     50.00%  
Two Years of Service [Member]
       
Defined Contribution Plans Disclosure [Line Items]        
Matching contributions, vesting percentage     100.00%  
Minimum [Member]
       
Defined Contribution Plans Disclosure [Line Items]        
401(k) eligible age of employee     21 years  
Minimum [Member] | 50% Matching Contribution [Member]
       
Defined Contribution Plans Disclosure [Line Items]        
Percentage of salary deferrals     2.00%  
Maximum [Member]
       
Defined Contribution Plans Disclosure [Line Items]        
Percentage of salary deferrals     3.50%  
Maximum [Member] | 50% Matching Contribution [Member]
       
Defined Contribution Plans Disclosure [Line Items]        
Percentage of salary deferrals     6.00%