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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Multiemployer Plans [Line Items] |  |  |
Contributions | $ 167,297 | $ 147,056 | $ 137,991
Plumbers & Pipefitters National Pension Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
EIN | 526152779 |  |
Pension Plan Number | 001 |  |
PPA Zone Status | Yellow | Yellow |
FIP/RP Status | Implemented |  |
Contributions | $ 12,034 | $ 12,021 | 10,425
Sheet Metal Workers National Pension Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
EIN | 526112463 |  |
Pension Plan Number | 001 |  |
PPA Zone Status | Yellow | Yellow |
FIP/RP Status | Implemented |  |
Contributions | $ 11,280 | $ 10,891 | 9,977
Northern California Pipe Trades Pension Plan |  |  |
Multiemployer Plans [Line Items] |  |  |
EIN | 526054620 |  |
Pension Plan Number | 001 |  |
PPA Zone Status | Red | Red |
FIP/RP Status | Implemented |  |
Contributions | $ 11,075 | $ 6,697 | 6,000
National Electrical Benefit Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
EIN | 530181657 |  |
Pension Plan Number | 001 |  |
PPA Zone Status | Green | Green |
FIP/RP Status | NA |  |
Contributions | $ 10,328 | $ 8,513 | 7,985
Pension, Hospitalization & Benefit Plan of the Electrical Industry- Pension Trust Account |  |  |
Multiemployer Plans [Line Items] |  |  |
EIN | 136123601 |  |
Pension Plan Number | 001 |  |
PPA Zone Status | Green | Green |
FIP/RP Status | NA |  |
Contributions | $ 9,687 | $ 7,543 | 6,219
NECA-IBEW Pension Trust Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
EIN | 943190386 |  |
Pension Plan Number | 001 |  |
PPA Zone Status | Green | Green |
FIP/RP Status | NA |  |
Contributions | $ 6,495 | $ 3,544 | 3,270
Central Pension Fund of the IUOE & Participating Employers |  |  |
Multiemployer Plans [Line Items] |  |  |
EIN | 366052390 |  |
Pension Plan Number | 001 |  |
PPA Zone Status | Green | Green |
FIP/RP Status | NA |  |
Contributions | $ 6,211 | $ 6,465 | 6,518
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 | Green | Green |
FIP/RP Status | NA |  |
Contributions | $ 5,518 | $ 5,759 | 4,051
Plumbers Pipefitters & Mechanical Equipment Service Local Union 392 Pension Plan |  |  |
Multiemployer Plans [Line Items] |  |  |
EIN | 310655223 |  |
Pension Plan Number | 001 |  |
PPA Zone Status | Red | Red |
FIP/RP Status | Implemented |  |
Contributions | $ 5,202 | $ 5,554 | 4,962
Sheet Metal Workers Pension Plan of Northern California |  |  |
Multiemployer Plans [Line Items] |  |  |
EIN | 516115939 |  |
Pension Plan Number | 001 |  |
PPA Zone Status | Red | Red |
FIP/RP Status | Implemented |  |
Contributions | $ 5,164 | $ 4,851 | 3,467
Southern California Pipe Trades Retirement Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
EIN | 516108443 |  |
Pension Plan Number | 001 |  |
PPA Zone Status | Green | Green |
FIP/RP Status | NA |  |
Contributions | $ 4,371 | $ 2,743 | 2,863
Pipefitters Union Local 537 Pension Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
EIN | 516030859 |  |
Pension Plan Number | 001 |  |
PPA Zone Status | Green | Green |
FIP/RP Status | NA |  |
Contributions | $ 3,970 | $ 3,939 | 2,981
NECA-IBEW Pension Trust Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
EIN | 516029903 |  |
Pension Plan Number | 001 |  |
PPA Zone Status | Green | Green |
FIP/RP Status | NA |  |
Contributions | $ 3,752 | $ 1,498 | 1,287
Eighth District Electrical Pension Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
EIN | 846100393 |  |
Pension Plan Number | 001 |  |
PPA Zone Status | Green | Green |
FIP/RP Status | NA |  |
Contributions | $ 3,444 | $ 3,411 | 2,695
Electrical Workers Local No. 26 Pension Trust Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
EIN | 526117919 |  |
Pension Plan Number | 001 |  |
PPA Zone Status | Green | Green |
FIP/RP Status | NA |  |
Contributions | $ 3,390 | $ 2,620 | 2,880
Southern California IBEW-NECA Pension Trust Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
EIN | 956392774 |  |
Pension Plan Number | 001 |  |
PPA Zone Status | Red | Orange |
FIP/RP Status | Implemented |  |
Contributions | $ 3,289 | $ 2,894 | 2,776
U.A. Plumbers Local 24 Pension Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
EIN | 226042823 |  |
Pension Plan Number | 001 |  |
PPA Zone Status | Green | Green |
FIP/RP Status | NA |  |
Contributions | $ 3,147 | $ 2,431 | 1,998
Sheet Metal Workers Pension Plan of Southern California, Arizona & Nevada |  |  |
Multiemployer Plans [Line Items] |  |  |
EIN | 956052257 |  |
Pension Plan Number | 001 |  |
PPA Zone Status | Yellow | Red |
FIP/RP Status | Pending |  |
Contributions | $ 2,946 | $ 2,310 | 1,824
U.A. Local 393 Pension Trust Fund Defined Benefit |  |  |
Multiemployer Plans [Line Items] |  |  |
EIN | 946359772 |  |
Pension Plan Number | 002 |  |
PPA Zone Status | Green | Green |
FIP/RP Status | NA |  |
Contributions | $ 2,490 | $ 4,597 | 3,585
Heating, Piping & Refrigeration Pension Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
EIN | 521058013 |  |
Pension Plan Number | 001 |  |
PPA Zone Status | Green | Green |
FIP/RP Status | NA |  |
Contributions | $ 2,402 | $ 1,948 | 1,877
San Diego Electrical Pension Plan |  |  |
Multiemployer Plans [Line Items] |  |  |
EIN | 956101801 |  |
Pension Plan Number | 001 |  |
PPA Zone Status | Green | Red |
FIP/RP Status | NA |  |
Contributions | $ 2,216 | $ 2,109 | 1,878
Boilermaker-Blacksmith National Pension Trust |  |  |
Multiemployer Plans [Line Items] |  |  |
EIN | 486168020 |  |
Pension Plan Number | 001 |  |
PPA Zone Status | Yellow | Yellow |
FIP/RP Status | Implemented |  |
Contributions | $ 1,710 | $ 1,367 | 1,177
U.A. Local 38 Defined Benefit Pension Plan |  |  |
Multiemployer Plans [Line Items] |  |  |
EIN | 941285319 |  |
Pension Plan Number | 001 |  |
PPA Zone Status | Yellow | Yellow |
FIP/RP Status | Implemented |  |
Contributions | $ 1,521 | $ 1,526 | 1,605
Plumbing & Pipe Fitting Local 219 Pension Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
EIN | 346682376 |  |
Pension Plan Number | 001 |  |
PPA Zone Status | Red | Red |
FIP/RP Status | Implemented |  |
Contributions | $ 838 | $ 1,262 | 1,107
Plumbers & Pipefitters Local Union No. 502 & 633 Pension Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
EIN | 616078145 |  |
Pension Plan Number | 001 |  |
PPA Zone Status | Red | Red |
FIP/RP Status | Implemented |  |
Contributions | $ 713 | $ 365 | 232
Steamfitters Local Union No. 420 Pension Plan |  |  |
Multiemployer Plans [Line Items] |  |  |
EIN | 232004424 |  |
Pension Plan Number | 001 |  |
PPA Zone Status | Red | Red |
FIP/RP Status | Implemented |  |
Contributions | $ 709 | $ 845 | 862
Carpenters Pension Trust Fund for Northern California |  |  |
Multiemployer Plans [Line Items] |  |  |
EIN | 946050970 |  |
Pension Plan Number | 001 |  |
PPA Zone Status | Red | Red |
FIP/RP Status | Implemented |  |
Contributions | $ 584 | $ 380 | 522
Other Multiemployer Pension Plans |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions | $ 42,811 | $ 38,973 | $ 42,968

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