Related Party Transactions - Schedule of Asset Purchase Agreement Relating to the Territories (Detail)	6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014
Johnson City and Morristown Tennessee [Member]
Business Acquisition [Line Items]
Asset Agreement Date	May 07, 2014
Acquisition Closing Date	May 23, 2014	May 23, 2014
Knoxville, Tennessee [Member]
Business Acquisition [Line Items]
Asset Agreement Date	Aug. 28, 2014
Acquisition Closing Date	Oct. 24, 2014	Oct. 24, 2014
Cleveland and Cookeville Tennessee [Member]
Business Acquisition [Line Items]
Asset Agreement Date	Dec. 05, 2014
Acquisition Closing Date	Jan. 30, 2015
Louisville, Kentucky and Evansville, Indiana [Member]
Business Acquisition [Line Items]
Asset Agreement Date	Dec. 17, 2014
Acquisition Closing Date	Feb. 27, 2015
Paducah and Pikeville, Kentucky [Member]
Business Acquisition [Line Items]
Asset Agreement Date	Feb. 13, 2015
Acquisition Closing Date	May 01, 2015