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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.

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