Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Additional Information (Detail)

v2.4.1.9
Employee Benefit Plans - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]      
Maximum annual contributions per employee percent 15.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent    
Minimum age for employees to be covered under profit sharing plan 21 years    
Minimum service period for employees to be covered under profit sharing plan 6 months    
Vesting period for company contributions to benefit plan 6 years    
Employer contribution $ 0us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount $ 0us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount $ 0us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount