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Lease Commitments - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jan. 01, 2017
Dec. 31, 2017
Leases Disclosure [Line Items]    
Assignment fee received $ 4.3  
Remaining lease term   3 years
Deferred lease revenue   $ 2.9
Deferred lease revenue to be recognized in fiscal 2018   0.9
Deferred lease revenue to be recognized in fiscal 2019   0.9
Deferred lease revenue to be recognized in fiscal 2020   $ 0.9
Minimum [Member]    
Leases Disclosure [Line Items]    
Operating lease renewal options, period   5 years
Maximum [Member]    
Leases Disclosure [Line Items]    
Operating lease renewal options, period   10 years