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Multiemployer Pension Plans (Detail) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2016

Dec. 31, 2015

Dec. 31, 2014

Defined Benefit Plan Disclosure [Line Items]

Contributions

$ 6,482

$ 6,715

$ 6,282

Defined contribution plans contributions charged to expense

$ 9,800

$ 9,500

9,000

Central States, Southeast and Southwest Areas Pension Fund

Defined Benefit Plan Disclosure [Line Items]

EIN/Pension Plan Number

^[1]

36-6044243/001

Pension Protection Act Zone Status

^[2]

Red

Red

FIP / RP Status Pending / Implemented

Implemented

Contributions

$ 1,979

$ 1,996

1,806

Surcharge Imposed

No

Expiration Dates of Collective Bargaining Agreements, First

Aug. 31, 2017

Expiration Dates of Collective Bargaining Agreements, Last

Dec. 31, 2019

United Food and Commercial Workers Local One Pension Fund

Defined Benefit Plan Disclosure [Line Items]

EIN/Pension Plan Number

16-6144007/001

Pension Protection Act Zone Status

Red

Red

FIP / RP Status Pending / Implemented

Implemented

Contributions

$ 199

$ 169

136

Surcharge Imposed

No

Expiration Dates of Collective Bargaining Agreements, First

Dec. 31, 2017

Pension Fund All Other

Defined Benefit Plan Disclosure [Line Items]

Contributions

$ 4,304

$ 4,550

$ 4,340

Maximum [Member]

Defined Benefit Plan Disclosure [Line Items]

Multi Employer Plans Status Funded Percentage

65.00%

[1]	The applicable collective bargaining agreements related to this pension fund expire between August 31, 2017 and December 31, 2019.
[2]	Under the Multiemployer Pension Reform Act of 2014, the status of this pension fund for each of 2016 and 2015 was critical and declining, as defined under such Act.

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Entity Tax Identification and Plan Number

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Multi employer Plans Status Funded Percentage

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The amount of the cost recognized during the period for defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 5
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947

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Indicate the multiemployer plan's certified zone status as currently required by the Pension Protection Act of 2006 or a subsequent amendment thereof. The zone status categories are red (critical status), orange (seriously endangered), yellow (endangered), and green (none of the above). The acceptable values are "red", "orange", "yellow", "green", "other", and "NA". A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

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-Publisher FASB
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-SubTopic 80
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947

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Expiration date of the collective bargaining arrangement requiring contributions to the multiemployer plan that will expire first in a group of associated collective bargaining arrangements, in CCYY-MM-DD format. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 715
-SubTopic 80
-Section 50
-Paragraph 5
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 80
-Section 50
-Paragraph 5
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947

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+ References

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-Publisher FASB
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-Section 50
-Paragraph 5
-Subparagraph (f)(1)
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947

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Indicate whether the employer paid a surcharge to the pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. The acceptable values are "no", "yes", and "NA".

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-Section 50
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