Associate Benefit Plans - Additional Information (Detail)	9 Months Ended
Sep. 30, 2015
Postemployment Benefits [Abstract]
Postretirement benefit plans eligibility term	Only those Associates who have achieved ten years of service
Amortization of unrecognized gains losses exceed percentage	10.00%

A description of the events that resulted in the settlement or curtailment of the employer's defined benefit plans.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (r)

-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

Name:	us-gaap_DefinedBenefitPlanDescriptionOfSettlementsAndCurtailments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration