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Employee Savings Plan - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Y
Dec. 31, 2012
Dec. 31, 2011
Compensation And Retirement Disclosure [Abstract]      
Minimum age eligible to defined contribution plan 21    
Maximum contributable pre tax salary of employee under defined contribution plan 25.00%    
Company contribution per dollar of employee contribution $ 0.5    
Maximum contribution by company expressed as percentage of employee pre-tax salary 3.00%    
Company contributions vest at end of two years 20.00%    
Company contributions vest at end of three years 40.00%    
Company contributions vest at end of four years 60.00%    
Company contributions vest at end of five years 100.00%    
Defined contribution plan, cost recognized $ 1,423,000 $ 1,362,000 $ 1,218,000