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Retirement Plans - Schedule of Multiemployer Plans (Details) - Multiemployer Plan, Plan Information, Available - Domestic - Multiemployer Plans, Pension - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Multiemployer Plans [Line Items]      
Contributions $ 179,216 $ 167,297 $ 147,056
National Automatic Sprinkler Industry Pension Fund      
Multiemployer Plans [Line Items]      
EIN 526054620    
Pension Plan Number 001    
PPA Zone Status [1] Red Red  
FIP/RP Status Implemented    
Contributions greater than 5% [2] false    
Contributions $ 14,228 $ 11,075 6,697
Sheet Metal Workers National Pension Fund      
Multiemployer Plans [Line Items]      
EIN 526112463    
Pension Plan Number 001    
PPA Zone Status [1] Yellow Yellow  
FIP/RP Status Implemented    
Contributions greater than 5% [2] false    
Contributions $ 12,895 $ 11,280 10,891
Plumbers & Pipefitters National Pension Fund      
Multiemployer Plans [Line Items]      
EIN 526152779    
Pension Plan Number 001    
PPA Zone Status [1] Yellow Yellow  
FIP/RP Status Implemented    
Contributions greater than 5% [2] false    
Contributions $ 12,550 $ 12,034 12,021
National Electrical Benefit Fund      
Multiemployer Plans [Line Items]      
EIN 530181657    
Pension Plan Number 001    
PPA Zone Status [1] Green Green  
FIP/RP Status NA    
Contributions greater than 5% [2] false    
Contributions $ 11,572 $ 10,328 8,513
Pension, Hospitalization & Benefit Plan of the Electrical Industry- Pension Trust Account      
Multiemployer Plans [Line Items]      
EIN 136123601    
Pension Plan Number 001    
PPA Zone Status [1] Green Green  
FIP/RP Status NA    
Contributions greater than 5% [2] false    
Contributions $ 9,489 $ 9,687 7,543
Plumbers Pipefitters & Mechanical Equipment Service Local Union 392 Pension Plan      
Multiemployer Plans [Line Items]      
EIN 310655223    
Pension Plan Number 001    
PPA Zone Status [1] Red Red  
FIP/RP Status Implemented    
Contributions greater than 5% [2] true    
Contributions $ 6,084 $ 5,202 5,554
Central Pension Fund of the IUOE & Participating Employers      
Multiemployer Plans [Line Items]      
EIN 366052390    
Pension Plan Number 001    
PPA Zone Status [1] Green Green  
FIP/RP Status NA    
Contributions greater than 5% [2] false    
Contributions $ 6,070 $ 6,211 6,465
Sheet Metal Workers Pension Plan of Northern California      
Multiemployer Plans [Line Items]      
EIN 516115939    
Pension Plan Number 001    
PPA Zone Status [1] Red Red  
FIP/RP Status Implemented    
Contributions greater than 5% [2] false    
Contributions $ 6,023 $ 5,164 4,851
Electrical Contractors Association of the City of Chicago Local Union 134, IBEW Joint Pension Trust of Chicago Pension Plan 2      
Multiemployer Plans [Line Items]      
EIN 516030753    
Pension Plan Number 002    
PPA Zone Status [1] Green Green  
FIP/RP Status NA    
Contributions greater than 5% [2] false    
Contributions $ 5,537 $ 5,518 5,759
Electrical Workers Local No. 26 Pension Trust Fund      
Multiemployer Plans [Line Items]      
EIN 526117919    
Pension Plan Number 001    
PPA Zone Status [1] Green Green  
FIP/RP Status NA    
Contributions greater than 5% [2] true    
Contributions $ 4,441 $ 3,390 2,620
Pipefitters Union Local 537 Pension Fund      
Multiemployer Plans [Line Items]      
EIN 516030859    
Pension Plan Number 001    
PPA Zone Status [1] Green Green  
FIP/RP Status NA    
Contributions greater than 5% [2] true    
Contributions $ 4,057 $ 3,970 3,939
Southern California Pipe Trades Retirement Fund      
Multiemployer Plans [Line Items]      
EIN 516108443    
Pension Plan Number 001    
PPA Zone Status [1] Green Green  
FIP/RP Status NA    
Contributions greater than 5% [2] false    
Contributions $ 3,907 $ 4,371 2,743
Eighth District Electrical Pension Fund      
Multiemployer Plans [Line Items]      
EIN 846100393    
Pension Plan Number 001    
PPA Zone Status [1] Green Green  
FIP/RP Status NA    
Contributions greater than 5% [2] true    
Contributions $ 3,786 $ 3,444 3,411
Southern California IBEW-NECA Pension Trust Fund      
Multiemployer Plans [Line Items]      
EIN 956392774    
Pension Plan Number 001    
PPA Zone Status [1] Red Red  
FIP/RP Status [3] Pending    
Contributions greater than 5% [2] false    
Contributions $ 3,669 $ 3,289 2,894
Sheet Metal Workers Pension Plan of Southern California, Arizona & Nevada      
Multiemployer Plans [Line Items]      
EIN 956052257    
Pension Plan Number 001    
PPA Zone Status [1] Yellow Yellow  
FIP/RP Status Implemented    
Contributions greater than 5% [2] false    
Contributions $ 3,268 $ 2,946 2,310
U.A. Plumbers Local 24 Pension Fund      
Multiemployer Plans [Line Items]      
EIN 226042823    
Pension Plan Number 001    
PPA Zone Status [1] Green Green  
FIP/RP Status NA    
Contributions greater than 5% [2] true    
Contributions $ 3,092 $ 3,147 2,431
NECA-IBEW Pension Trust Fund      
Multiemployer Plans [Line Items]      
EIN 516029903    
Pension Plan Number 001    
PPA Zone Status [1] Green Green  
FIP/RP Status NA    
Contributions greater than 5% [2] false    
Contributions $ 3,060 $ 3,752 1,498
Northern California Pipe Trades Pension Plan      
Multiemployer Plans [Line Items]      
EIN 943190386    
Pension Plan Number 001    
PPA Zone Status [1] Green Green  
FIP/RP Status NA    
Contributions greater than 5% [2] true    
Contributions $ 2,963 $ 6,495 3,544
San Diego Electrical Pension Plan      
Multiemployer Plans [Line Items]      
EIN 956101801    
Pension Plan Number 001    
PPA Zone Status [1] Green Green  
FIP/RP Status NA    
Contributions greater than 5% [2] true    
Contributions $ 2,862 $ 2,216 2,109
Heating, Piping & Refrigeration Pension Fund      
Multiemployer Plans [Line Items]      
EIN 521058013    
Pension Plan Number 001    
PPA Zone Status [1] Green Green  
FIP/RP Status NA    
Contributions greater than 5% [2] false    
Contributions $ 2,437 $ 2,402 1,948
U.A. Local 38 Defined Benefit Pension Plan      
Multiemployer Plans [Line Items]      
EIN 941285319    
Pension Plan Number 001    
PPA Zone Status [1] Green Yellow  
FIP/RP Status NA    
Contributions greater than 5% [2] false    
Contributions $ 2,097 $ 1,521 1,526
Plumbing & Pipe Fitting Local 219 Pension Fund      
Multiemployer Plans [Line Items]      
EIN 346682376    
Pension Plan Number 001    
PPA Zone Status [1] Red Red  
FIP/RP Status Implemented    
Contributions greater than 5% [2] true    
Contributions $ 1,335 $ 838 1,262
Boilermaker-Blacksmith National Pension Trust      
Multiemployer Plans [Line Items]      
EIN 486168020    
Pension Plan Number 001    
PPA Zone Status [1] Red Yellow  
FIP/RP Status [3] Pending    
Contributions greater than 5% [2] false    
Contributions $ 1,083 $ 1,710 1,367
Steamfitters Local Union No. 420 Pension Plan      
Multiemployer Plans [Line Items]      
EIN 232004424    
Pension Plan Number 001    
PPA Zone Status [1] Red Red  
FIP/RP Status Implemented    
Contributions greater than 5% [2] false    
Contributions $ 687 $ 709 845
South Florida Electrical Workers Pension Plan and Trust      
Multiemployer Plans [Line Items]      
EIN 596230530    
Pension Plan Number 001    
PPA Zone Status [1] Red Yellow  
FIP/RP Status Implemented    
Contributions greater than 5% [2] false    
Contributions $ 503 $ 263 116
Other Multiemployer Pension Plans      
Multiemployer Plans [Line Items]      
Contributions $ 50,720 $ 45,622 $ 43,834
[1] The zone status represents the most recent available information for the respective MEPP, which may be 2016 or earlier for the 2017 year and 2015 or earlier for the 2016 year.
[2] This information was obtained from the respective plan’s Form 5500 (“Forms”) for the most current available filing. These dates may not correspond with our fiscal year contributions. The above noted percentages of contributions are based upon disclosures contained in the plans’ Forms. Those Forms, among other things, disclose the names of individual participating employers whose annual contributions account for more than 5% of the aggregate annual amount contributed by all participating employers for a plan year. Accordingly, if the annual contribution of two or more of our subsidiaries each accounted for less than 5% of such contributions, but in the aggregate accounted for in excess of 5% of such contributions, that greater percentage is not available and accordingly is not disclosed.
[3] For these respective plans, a funding surcharge was in effect during 2017.