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Multiemployer Pension Plans - (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Multiemployer Plans [Line Items] |  |
Contributions | $ 16,109 | $ 17,052
Heating, Piping and Refrigeration Pension Fund |  |
Multiemployer Plans [Line Items] |  |
Contributions | 1,045 | 1,101
Plumbers Local No 98 Defined Benefit Pension Fund |  |
Multiemployer Plans [Line Items] |  |
Contributions | 1,658 | 1,140
Plumbers and Pipefitters National Pension Fund |  |
Multiemployer Plans [Line Items] |  |
Contributions | 947 | 1,040
Pipefitters Local 636 Defined Benefit Pension Fund |  |
Multiemployer Plans [Line Items] |  |
Contributions | 1,206 | 1,369
Sheet Metal Workers' Pension Plan of Southern California, Arizona and Nevada |  |
Multiemployer Plans [Line Items] |  |
Contributions | 1,322 | 1,908
Sheet Metal Workers’ National Pension Fund |  |
Multiemployer Plans [Line Items] |  |
Contributions | 1,144 | 1,509
Sheet Metal Workers Local Union No. 80 Pension Fund |  |
Multiemployer Plans [Line Items] |  |
Contributions | 1,383 | 1,033
Sheet Metal Workers Local 98 Pension Fund |  |
Multiemployer Plans [Line Items] |  |
Contributions | 945 | 927
Steamfitters Local Union No. 420 Pension Fund |  |
Multiemployer Plans [Line Items] |  |
Contributions | 591 | 825
Pipefitters Union Local No. 537 Pension Fund |  |
Multiemployer Plans [Line Items] |  |
Contributions | 1,337 | 1,579
Plumbers & Pipefitters Local No 189 Pension Plan |  |
Multiemployer Plans [Line Items] |  |
Contributions | 598 | 544
Plumbers & Pipefitters of Local Union No. 333 Pension Fund |  |
Multiemployer Plans [Line Items] |  |
Contributions | 1,329 | 645
Southern California Pipe Trades Retirement Fund |  |
Multiemployer Plans [Line Items] |  |
Contributions | 662 | 1,015
Electrical Workers Local No. 26 Pension Trust Fund |  |
Multiemployer Plans [Line Items] |  |
Contributions | 348 | 341
Plumbers Union Local No. 12 Pension |  |
Multiemployer Plans [Line Items] |  |
Contributions | 261 | 322
Sheet Metal Workers Local 7, Zone 1 Pension Plan |  |
Multiemployer Plans [Line Items] |  |
Contributions | 383 | 350
Plumbers & Steamfitters Local 577 Pension Plan |  |
Multiemployer Plans [Line Items] |  |
Contributions | 208 | 217
Laborers District Council Pension and Disability Trust Fund No. 2 |  |
Multiemployer Plans [Line Items] |  |
Contributions | 147 | 399
Laborers District Council Pension and Disability Trust Fund No. 2 |  |
Multiemployer Plans [Line Items] |  |
Contributions | 37 | 49
National Electrical Benefit Fund |  |
Multiemployer Plans [Line Items] |  |
Contributions | 111 | 105
Airconditioning and Refrigeration Industry Retirement Trust Fund |  |
Multiemployer Plans [Line Items] |  |
Contributions | 144 | 144
Plumbers and Steamfitters Local 486 Pension Fund |  |
Multiemployer Plans [Line Items] |  |
Contributions | 40 | 44
Steamfitters Local #449 Pension Plan |  |
Multiemployer Plans [Line Items] |  |
Contributions | 109 | 185
United Association Local Union No. 322 Pension Plan |  |
Multiemployer Plans [Line Items] |  |
Contributions | 18 | 38
Sheet Metal Workers Local 224 Pension Fund |  |
Multiemployer Plans [Line Items] |  |
Contributions | 20 | 17
Plumbers Local 27 Pension Fund |  |
Multiemployer Plans [Line Items] |  |
Contributions | 18 | 56
All other plans |  |
Multiemployer Plans [Line Items] |  |
Contributions | $ 98 | $ 150

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