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Retirement Plans - Schedule of Multiemployer Plans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Multiemployer Plans [Line Items]      
EIN 11-2125338    
UNITED STATES | Multiemployer Plans, Pension      
Multiemployer Plans [Line Items]      
Contributions $ 204,082 $ 215,478 $ 190,229
UNITED STATES | Multiemployer Plans, Pension | National Automatic Sprinkler Industry Pension Fund      
Multiemployer Plans [Line Items]      
EIN 52-6054620    
Pension Plan Number 001    
Zone Status [1] Red Red  
FIP/RP Status Implemented    
Contributions $ 17,504 $ 15,924 14,888
Contributions greater than 5% [2] false    
UNITED STATES | Multiemployer Plans, Pension | Plumbers & Pipefitters National Pension Fund      
Multiemployer Plans [Line Items]      
EIN 52-6152779    
Pension Plan Number 001    
Zone Status [1] Yellow Yellow  
FIP/RP Status Implemented    
Contributions $ 14,095 $ 13,821 11,868
Contributions greater than 5% [2] false    
UNITED STATES | Multiemployer Plans, Pension | Sheet Metal Workers National Pension Fund      
Multiemployer Plans [Line Items]      
EIN 52-6112463    
Pension Plan Number 001    
Zone Status [1] Yellow Yellow  
FIP/RP Status Implemented    
Contributions $ 11,621 $ 11,713 10,895
Contributions greater than 5% [2] false    
UNITED STATES | Multiemployer Plans, Pension | National Electrical Benefit Fund      
Multiemployer Plans [Line Items]      
EIN 53-0181657    
Pension Plan Number 001    
Zone Status [1] Green Green  
FIP/RP Status NA    
Contributions $ 11,573 $ 16,901 10,700
Contributions greater than 5% [2] false    
UNITED STATES | Multiemployer Plans, Pension | Pension, Hospitalization & Benefit Plan of the Electrical Industry-Pension Trust Account      
Multiemployer Plans [Line Items]      
EIN 13-6123601    
Pension Plan Number 001    
Zone Status [1] Green Green  
FIP/RP Status NA    
Contributions $ 11,264 $ 10,075 10,469
Contributions greater than 5% [2] false    
UNITED STATES | Multiemployer Plans, Pension | Electrical Workers Local No. 26 Pension Trust Fund      
Multiemployer Plans [Line Items]      
EIN 52-6117919    
Pension Plan Number 001    
Zone Status [1] Green Green  
FIP/RP Status NA    
Contributions $ 7,086 $ 8,434 5,485
Contributions greater than 5% [2] true    
UNITED STATES | Multiemployer Plans, Pension | Sheet Metal Workers Pension Plan of Northern California      
Multiemployer Plans [Line Items]      
EIN 51-6115939    
Pension Plan Number 001    
Zone Status [1] Red Red  
FIP/RP Status Implemented    
Contributions $ 6,605 $ 6,233 5,488
Contributions greater than 5% [2] false    
UNITED STATES | Multiemployer Plans, Pension | Central Pension Fund of the IUOE & Participating Employers      
Multiemployer Plans [Line Items]      
EIN 36-6052390    
Pension Plan Number 001    
Zone Status [1] Green Green  
FIP/RP Status NA    
Contributions $ 6,115 $ 6,253 6,384
Contributions greater than 5% [2] false    
UNITED STATES | Multiemployer Plans, Pension | Southern California IBEW-NECA Pension Trust Fund      
Multiemployer Plans [Line Items]      
EIN 95-6392774    
Pension Plan Number 001    
Zone Status [1] Yellow Yellow  
FIP/RP Status Implemented    
Contributions $ 5,719 $ 6,277 5,754
Contributions greater than 5% [2] false    
UNITED STATES | Multiemployer Plans, Pension | Plumbers Pipefitters & Mechanical Equipment Service Local Union 392 Pension Plan      
Multiemployer Plans [Line Items]      
EIN 31-0655223    
Pension Plan Number 001    
Zone Status [1] Red Red  
FIP/RP Status Implemented    
Contributions $ 5,667 $ 6,412 6,047
Contributions greater than 5% [2] true    
UNITED STATES | Multiemployer Plans, Pension | San Diego Electrical Pension Plan      
Multiemployer Plans [Line Items]      
EIN 95-6101801    
Pension Plan Number 001    
Zone Status [1] Green Green  
FIP/RP Status NA    
Contributions $ 4,383 $ 3,843 3,008
Contributions greater than 5% [2] true    
UNITED STATES | Multiemployer Plans, Pension | Pipefitters Union Local 537 Pension Fund      
Multiemployer Plans [Line Items]      
EIN 51-6030859    
Pension Plan Number 001    
Zone Status [1] Green Green  
FIP/RP Status NA    
Contributions $ 4,275 $ 4,754 6,038
Contributions greater than 5% [2] true    
UNITED STATES | Multiemployer Plans, Pension | Arizona Pipe Trades Pension Trust Fund      
Multiemployer Plans [Line Items]      
EIN 86-6025734    
Pension Plan Number 001    
Zone Status [1] Green Green  
FIP/RP Status NA    
Contributions $ 4,142 $ 6,071 2,640
Contributions greater than 5% [2] true    
UNITED STATES | Multiemployer Plans, Pension | Southern California Pipe Trades Retirement Fund      
Multiemployer Plans [Line Items]      
EIN 51-6108443    
Pension Plan Number 001    
Zone Status [1] Green Green  
FIP/RP Status NA    
Contributions $ 4,043 $ 3,274 3,095
Contributions greater than 5% [2] false    
UNITED STATES | Multiemployer Plans, Pension | Edison Pension Plan      
Multiemployer Plans [Line Items]      
EIN 93-6061681    
Pension Plan Number 001    
Zone Status [1] Green Green  
FIP/RP Status NA    
Contributions $ 3,864 $ 5,361 3,140
Contributions greater than 5% [2] true    
UNITED STATES | Multiemployer Plans, Pension | Heating, Piping & Refrigeration Pension Fund      
Multiemployer Plans [Line Items]      
EIN 52-1058013    
Pension Plan Number 001    
Zone Status [1] Green Green  
FIP/RP Status NA    
Contributions $ 3,349 $ 4,185 2,619
Contributions greater than 5% [2] false    
UNITED STATES | Multiemployer Plans, Pension | Eighth District Electrical Pension Fund      
Multiemployer Plans [Line Items]      
EIN 84-6100393    
Pension Plan Number 001    
Zone Status [1] Green Green  
FIP/RP Status NA    
Contributions $ 3,242 $ 3,590 3,486
Contributions greater than 5% [2] true    
UNITED STATES | Multiemployer Plans, Pension | U.A. Local 393 Pension Trust Fund Defined Benefit      
Multiemployer Plans [Line Items]      
EIN 94-6359772    
Pension Plan Number 002    
Zone Status [1] Green Green  
FIP/RP Status NA    
Contributions $ 3,168 $ 3,858 4,298
Contributions greater than 5% [2] true    
UNITED STATES | Multiemployer Plans, Pension | 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 51-6030753    
Pension Plan Number 002    
Zone Status [1] Green Green  
FIP/RP Status NA    
Contributions $ 3,004 $ 3,204 4,308
Contributions greater than 5% [2] false    
UNITED STATES | Multiemployer Plans, Pension | U.A. Local 38 Defined Benefit Pension Plan      
Multiemployer Plans [Line Items]      
EIN 94-1285319    
Pension Plan Number 001    
Zone Status [1] Green Green  
FIP/RP Status NA    
Contributions $ 2,874 $ 2,030 1,551
Contributions greater than 5% [2] false    
UNITED STATES | Multiemployer Plans, Pension | Sheet Metal Workers Pension Plan of Southern California, Arizona & Nevada      
Multiemployer Plans [Line Items]      
EIN 95-6052257    
Pension Plan Number 001    
Zone Status [1] Yellow Yellow  
FIP/RP Status Implemented    
Contributions $ 2,706 $ 2,423 1,934
Contributions greater than 5% [2] false    
UNITED STATES | Multiemployer Plans, Pension | Northern California Pipe Trades Pension Plan      
Multiemployer Plans [Line Items]      
EIN 94-3190386    
Pension Plan Number 001    
Zone Status [1] Green Green  
FIP/RP Status NA    
Contributions $ 2,463 $ 3,077 3,104
Contributions greater than 5% [2] false    
UNITED STATES | Multiemployer Plans, Pension | U.A. Plumbers Local 24 Pension Fund      
Multiemployer Plans [Line Items]      
EIN 22-6042823    
Pension Plan Number 001    
Zone Status [1] Green Green  
FIP/RP Status NA    
Contributions $ 2,460 $ 2,460 3,461
Contributions greater than 5% [2] true    
UNITED STATES | Multiemployer Plans, Pension | NECA-IBEW Pension Trust Fund      
Multiemployer Plans [Line Items]      
EIN 51-6029903    
Pension Plan Number 001    
Zone Status [1] Green Green  
FIP/RP Status NA    
Contributions $ 2,369 $ 2,528 2,650
Contributions greater than 5% [2] true    
UNITED STATES | Multiemployer Plans, Pension | Northern California Electrical Workers Pension Plan      
Multiemployer Plans [Line Items]      
EIN 94-6062674    
Pension Plan Number 001    
Zone Status [1] Green Green  
FIP/RP Status NA    
Contributions $ 2,263 $ 965 1,075
Contributions greater than 5% [2] false    
UNITED STATES | Multiemployer Plans, Pension | Plumbing & Pipe Fitting Local 219 Pension Fund      
Multiemployer Plans [Line Items]      
EIN 34-6682376    
Pension Plan Number 001    
Zone Status [1] Red Red  
FIP/RP Status Implemented    
Contributions $ 1,680 $ 1,937 2,197
Contributions greater than 5% [2] true    
UNITED STATES | Multiemployer Plans, Pension | Boilermaker-Blacksmith National Pension Trust      
Multiemployer Plans [Line Items]      
EIN 48-6168020    
Pension Plan Number 001    
Zone Status [1] Yellow Red  
FIP/RP Status Implemented    
Contributions $ 1,574 $ 1,681 1,446
Contributions greater than 5% [2] false    
UNITED STATES | Multiemployer Plans, Pension | Plumbers & Pipefitters Local Union No. 502 & 633 Pension Fund      
Multiemployer Plans [Line Items]      
EIN 61-6078145    
Pension Plan Number 001    
Zone Status [1] Yellow Yellow  
FIP/RP Status Implemented    
Contributions $ 1,271 $ 1,596 1,167
Contributions greater than 5% [2] false    
UNITED STATES | Multiemployer Plans, Pension | I.B.E.W. Local 701 Pension Fund      
Multiemployer Plans [Line Items]      
EIN 36-6455509    
Pension Plan Number 001    
Zone Status [1] Yellow Yellow  
FIP/RP Status Implemented    
Contributions $ 1,197 $ 915 588
Contributions greater than 5% [2] false    
UNITED STATES | Multiemployer Plans, Pension | Steamfitters Local Union No. 420 Pension Plan      
Multiemployer Plans [Line Items]      
EIN 23-2004424    
Pension Plan Number 001    
Zone Status [1] Red Red  
FIP/RP Status Implemented    
Contributions $ 553 $ 641 706
Contributions greater than 5% [2] false    
UNITED STATES | Multiemployer Plans, Pension | Other Multiemployer Pension Plans      
Multiemployer Plans [Line Items]      
Contributions $ 51,953 $ 55,042 $ 49,740
[1] The zone status represents the most recent available information for the respective MEPP, which may be 2019 or earlier for the 2020 year and 2018 or earlier for the 2019 year. In general, plans with a “green” zone status have a funding ratio of at least 80%, plans with an “orange” or “yellow” zone status have a funding ratio of between 65% and less than 80%, and plans with a “red” zone status are less than 65% funded.
[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 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.