Related Party Transactions - Schedule of Definitive Agreements and Closing Dates for Each of Expansion Transactions Completed (Detail) - CCR [Member]		3 Months Ended	12 Months Ended
		Apr. 02, 2017	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
Lexington, Kentucky for Jackson, Tennessee Exchange [Member]
Business Acquisition [Line Items]
Definitive Agreement Date					Oct. 17, 2014
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	[1]		Sep. 01, 2016
Acquisition / Exchange Date			Oct. 28, 2016
Anderson Fort Wayne Lafayette South Bend And Terre Haute Indiana Acquisitions [Member]
Business Acquisition [Line Items]
Definitive Agreement Date			Sep. 01, 2016
Acquisition / Exchange Date		Jan. 27, 2017
Indianapolis and Bloomington, Indiana and Columbus and Mansfield, Ohio [Member]
Business Acquisition [Line Items]
Definitive Agreement Date			Sep. 01, 2016
Acquisition / Exchange Date		Mar. 31, 2017
Annapolis, Maryland Make-Ready Center [Member]
Business Acquisition [Line Items]
Definitive Agreement Date				Oct. 30, 2015
Acquisition / Exchange Date				Oct. 30, 2015
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
Indianapolis and Portland, Indiana [Member]
Business Acquisition [Line Items]
Definitive Agreement Date			Sep. 01, 2016
Acquisition / Exchange Date		Mar. 31, 2017

[1] As amended by Amendment No. 1, dated January 27, 2017.