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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
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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.

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