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Retirement Benefits - Multiemployer Pension Plans (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) plan | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Number of plans | plan |  | 4 |  |
Contributions |  | $ 5,292 | $ 6,423 | $ 6,482
Defined contribution plans contributions charged to expense |  | $ 12,000 | $ 11,800 | 9,800
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 |  | $ 1,797 | $ 1,873 | 1,979
Surcharge Imposed |  | No |  |
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 | [3] | 16-6144007/001 |  |
Pension Protection Act Zone Status |  | Red | Red |
FIP / RP Status Pending / Implemented |  | Implemented |  |
Contributions |  | $ 237 | $ 232 | 199
Surcharge Imposed |  | No |  |
Expiration Dates of Collective Bargaining Agreements, First |  | Dec. 31, 2020 |  |
Pension Fund All Other |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Contributions |  | $ 3,258 | $ 4,318 | $ 4,304
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 at various times in 2019.
[2] | Under the Multiemployer Pension Reform Act of 2014, the status of this pension fund for each of 2018 and 2017 was critical and declining, as defined under such Act.
[3] | The collective bargaining agreement related to this pension fund expires on December 31, 2020.

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- Definition 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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