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Accounting Policies - Additional Information (Detail)
3 Months Ended 6 Months Ended
Nov. 14, 2016
Oct. 18, 2016
$ / shares
Jun. 30, 2017
$ / shares
shares
Jun. 30, 2016
shares
Jun. 30, 2017
USD ($)
$ / shares
shares
Jun. 30, 2016
shares
Dec. 30, 2016
$ / shares
Accounting Policies [Abstract]              
Stock split ratio 1.5 1.5          
Common stock, par value | $ / shares   $ 0    
Shares, non-dilutive | shares     0 0 0 0  
Reclassifications effect on net income | $         $ 0