Related Party Transactions - Schedule of Asset Purchase Agreement Relating to the Territories (Detail) - CCR [Member]	12 Months Ended
	Jan. 01, 2017	Jan. 03, 2016	Dec. 28, 2014
Johnson City and Morristown Tennessee [Member]
Business Acquisition [Line Items]
Definitive Agreement Date			May 07, 2014
Acquisition / Exchange Date			May 23, 2014
Knoxville, Tennessee [Member]
Business Acquisition [Line Items]
Definitive Agreement Date			Aug. 28, 2014
Acquisition / Exchange Date			Oct. 24, 2014
Cleveland and Cookeville Tennessee [Member]
Business Acquisition [Line Items]
Definitive Agreement Date			Dec. 05, 2014
Acquisition / Exchange Date		Jan. 30, 2015
Louisville, Kentucky and Evansville, Indiana [Member]
Business Acquisition [Line Items]
Definitive Agreement Date			Dec. 17, 2014
Acquisition / Exchange Date		Feb. 27, 2015
Paducah and Pikeville, Kentucky [Member]
Business Acquisition [Line Items]
Definitive Agreement Date		Feb. 13, 2015
Acquisition / Exchange Date		May 01, 2015
Norfolk, Fredericksburg and Staunton, Virginia and Elizabeth City, North Carolina [Member]
Business Acquisition [Line Items]
Definitive Agreement Date		Sep. 23, 2015
Acquisition / Exchange Date		Oct. 30, 2015
Easton and Salisbury, Maryland and Richmond and Yorktown, Virginia [Member]
Business Acquisition [Line Items]
Definitive Agreement Date		Sep. 23, 2015
Acquisition / Exchange Date	Jan. 29, 2016
Alexandria, Virginia and Capitol Heights and La Plata, Maryland [Member]
Business Acquisition [Line Items]
Definitive Agreement Date		Sep. 23, 2015
Acquisition / Exchange Date	Apr. 01, 2016
Baltimore Hagerstown and Cumberland, Maryland [Member]
Business Acquisition [Line Items]
Definitive Agreement Date		Sep. 23, 2015
Acquisition / Exchange Date	Apr. 29, 2016
Cincinnati, Dayton, Lima and Portsmouth, Ohio and Louisa, Kentucky [Member]
Business Acquisition [Line Items]
Definitive Agreement Date	Sep. 01, 2016
Acquisition / Exchange Date	Oct. 28, 2016
Sandston, Virginia [Member]
Business Acquisition [Line Items]
Definitive Agreement Date		Oct. 30, 2015
Acquisition / Exchange Date	Jan. 29, 2016
Silver Spring and Baltimore, Maryland [Member]
Business Acquisition [Line Items]
Definitive Agreement Date		Oct. 30, 2015
Acquisition / Exchange Date	Apr. 29, 2016
Cincinnati, Ohio [Member]
Business Acquisition [Line Items]
Definitive Agreement Date	Sep. 01, 2016
Acquisition / Exchange Date	Oct. 28, 2016