Acquisitions - Summary of Fair Value Acquired Identifiable Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	0 Months Ended
	Jan. 30, 2015	Feb. 27, 2015	Mar. 29, 2015
Distribution Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Additions to other identifiable intangible related to acquisition			$ 45,600
Cleveland and Cookeville, Tennessee Territory Acquisitions [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Additions to other identifiable intangible related to acquisition	17,750
Cleveland and Cookeville, Tennessee Territory Acquisitions [Member] | Distribution Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Additions to other identifiable intangible related to acquisition	17,200
Estimated useful life	40 years
Cleveland and Cookeville, Tennessee Territory Acquisitions [Member] | Customer Lists [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Additions to other identifiable intangible related to acquisition	550
Estimated useful life	12 years
Louisville, Kentucky and Evansville, Indiana [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Additions to other identifiable intangible related to acquisition		29,600
Louisville, Kentucky and Evansville, Indiana [Member] | Distribution Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Additions to other identifiable intangible related to acquisition		28,400
Estimated useful life		40 years
Louisville, Kentucky and Evansville, Indiana [Member] | Customer Lists [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Additions to other identifiable intangible related to acquisition		$ 1,200
Estimated useful life		12 years