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Multiemployer Pension Plans (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
plan
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Number of plans | plan 4    
Contributions $ 6,423 $ 6,482 $ 6,715
Defined contribution plans contributions charged to expense $ 11,800 $ 9,800 9,500
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 $ 1,873 $ 1,979 1,996
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 $ 232 $ 199 169
Surcharge Imposed No    
Expiration Dates of Collective Bargaining Agreements, First Mar. 31, 2018    
Pension Fund All Other      
Defined Benefit Plan Disclosure [Line Items]      
Contributions $ 4,318 $ 4,304 $ 4,550
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 2017 and 2016 was critical and declining, as defined under such Act.
[3] The collective bargaining agreement related to this pension fund expires on March 31, 2018.