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Defined Contribution Plans - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 8 Months Ended 9 Months Ended
Jun. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 09, 2016
Sep. 30, 2017
Sep. 30, 2016
Defined Contribution Plan Disclosure [Line Items]            
Annual deferral limit           $ 18,000
Savings 401(k) Plan            
Defined Contribution Plan Disclosure [Line Items]            
401(k) Employer matching contribution, percent match, first 3%       100.00%    
401(k) Employer matching contribution, percent match, remaining 2%       50.00%    
Employer-matching contribution (percent)         50.00%  
Employer matching contribution, percent of employee's gross pay         6.00%  
Service period (in years)         3 years  
Contributions of eligible employee pretax salary (percent) (up to)         100.00%  
Annual deferral limit         $ 18,000  
Amount of employer contributions during period   $ 500,000 $ 800,000   1,300,000 $ 2,600,000
Non-Qualified Deferred Compensation Plan            
Defined Contribution Plan Disclosure [Line Items]            
Employer-matching contribution (percent) 50.00%          
Employer matching contribution, percent of employee's gross pay 6.00%          
Plan vesting period (in years) 3 years          
Rabbi trust assets   $ 700,000     $ 700,000