Fair Value of Financial Instruments - Summary of Reconciliation of Acquisition Related Contingent Consideration (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 29, 2015	Mar. 30, 2014
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Opening balance	$ 46,850	$ 0
Accrual of Q1 2015 payment	(717)	0
Fair value adjustment	5,089	0
Ending balance	98,505	0
Cleveland and Cookeville, Tennessee Territory Acquisitions [Member]
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Increase due to an acquisition	14,572	0
Louisville, Kentucky and Evansville, Indiana [Member]
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Increase due to an acquisition	$ 32,711	$ 0

Business combination contingent consideration accrual.

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- Definition

Business combination contingent consideration increase due to an acquisition.

+ References

No definition available.

+ Details

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- Definition

Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 4

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479

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- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 25

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 35

-Paragraph 1

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-URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478

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