Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Retirement Plan - Additional Information (Detail)

v3.10.0.1
Retirement Plan - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Jan. 01, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Contribution Plan Disclosure [Line Items]        
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 100.00% 75.00%    
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 3.00% 4.00%    
Defined Contribution Plan Employer Matching Additional Contribution Upon Employee Percent 50.00%      
Defined Contribution Plan Additional Maximum Annual Contributions Per Employee Percent 2.00%      
Defined Contribution Plan, Employer Discretionary Contribution Amount   $ 2.7 $ 2.5 $ 1.7
Maximum        
Defined Contribution Plan Disclosure [Line Items]        
Defined Contribution Plan, Employer Matching Contribution, Percent of Match   3.00%    
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage 4.00%