Related Party Transactions - Schedule of Asset Purchase Agreement Relating to the Territories (Detail)	9 Months Ended
	Sep. 27, 2015	Sep. 28, 2014
Johnson City and Morristown Tennessee [Member]
Business Acquisition [Line Items]
Asset Agreement Date		May 07, 2014
Acquisition Closing Date		May 23, 2014
Knoxville, Tennessee [Member]
Business Acquisition [Line Items]
Asset Agreement Date		Aug. 28, 2014
Acquisition Closing Date		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