XML 101 R83.htm IDEA: XBRL DOCUMENT v3.3.1.900
Multiemployer Plans - Narrative (Details)
12 Months Ended
Dec. 31, 2015
USD ($)
plan
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Multiemployer Plans [Line Items]      
Withdrawal liability $ 0 $ 0 $ 100,000
Minimum | Multiemployer Plans, Pension      
Multiemployer Plans [Line Items]      
Number of plans | plan 200    
Domestic | Multiemployer Plans, Pension | Multiemployer Plan, Plan Information, Available      
Multiemployer Plans [Line Items]      
Contributions $ 147,056,000 137,991,000 141,271,000
Domestic | Multiemployer Plans, Postretirement Benefit | Multiemployer Plan, Plan Information, Not Available      
Multiemployer Plans [Line Items]      
Contributions 108,100,000 98,300,000 93,500,000
Domestic | Minimum | Multiemployer Plans, Pension | Multiemployer Plan, Plan Information, Available      
Multiemployer Plans [Line Items]      
Contributions $ 2,000,000    
UK Plan | Multiemployer Plans, Pension | Multiemployer Plan, Plan Information, Not Available      
Multiemployer Plans [Line Items]      
Number of plans | plan 2    
Contributions $ 200,000 $ 200,000 $ 300,000
Red Zone | Domestic | Minimum | Multiemployer Plans, Pension | Multiemployer Plan, Plan Information, Available      
Multiemployer Plans [Line Items]      
Contributions 500,000    
Orange or Yellow Zones | Domestic | Minimum | Multiemployer Plans, Pension | Multiemployer Plan, Plan Information, Available      
Multiemployer Plans [Line Items]      
Contributions $ 1,000,000    
UK Plan 1 | UK Plan | Multiemployer Plans, Pension | Multiemployer Plan, Plan Information, Not Available      
Multiemployer Plans [Line Items]      
Multiemployer Plans, Funded Status At least 80 percent    
UK Plan 2 | UK Plan | Multiemployer Plans, Pension | Multiemployer Plan, Plan Information, Not Available      
Multiemployer Plans [Line Items]      
Multiemployer Plans, Funded Status Between 65 and less than 80 percent