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Employee Benefits Plan - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of Employee Benefit Plans [Line Items]      
Maximum percentage of employee gross pay for defined contribution plan under Section 401(k) 50.00%    
Employer matching contribution for defined contribution plan under Section 401(k) 5.00%    
Total company matching contributions $ 2.2 $ 1.9 $ 2.1