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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, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Multiemployer Plans [Line Items] |  |  |  |
Contributions |  | $ 147,056 | $ 137,991 | $ 141,271
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 |  | $ 12,021 | $ 10,425 | 12,509
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 |  | $ 10,891 | $ 9,977 | 9,476
National Electrical Benefit Fund |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
EIN |  | 530181657 |  |
Pension Plan Number |  | 001 |  |
PPA Zone Status |  | Green | Green |
FIP/RP Status |  | NA |  |
Contributions |  | $ 8,513 | $ 7,985 | 7,986
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 |  | $ 7,543 | $ 6,219 | 6,189
National Automatic Sprinkler Industry Pension Fund |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
EIN |  | 526054620 |  |
Pension Plan Number |  | 001 |  |
PPA Zone Status |  | Red | Red |
FIP/RP Status |  | Implemented |  |
Contributions |  | $ 6,697 | $ 6,000 | 4,226
Central Pension Fund of the International Union of Operating Engineers and Participating Employers |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
EIN |  | 366052390 |  |
Pension Plan Number |  | 001 |  |
PPA Zone Status |  | Green | Green |
FIP/RP Status |  | NA |  |
Contributions |  | $ 6,465 | $ 6,518 | 6,296
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 |  | $ 5,759 | $ 4,051 | 2,412
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 |  | $ 5,554 | $ 4,962 | 4,128
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 |  | $ 4,851 | $ 3,467 | 3,658
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 |  | $ 4,597 | $ 3,585 | 2,811
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 |  | $ 3,939 | $ 2,981 | 3,690
Northern California Pipe Trades Pension Plan |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
EIN |  | 943190386 |  |
Pension Plan Number |  | 001 |  |
PPA Zone Status |  | Green | Green |
FIP/RP Status |  | NA |  |
Contributions |  | $ 3,544 | $ 3,270 | 2,258
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 |  | $ 3,411 | $ 2,695 | 3,005
Southern California IBEW-NECA Pension Trust Fund |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
EIN |  | 956392774 |  |
Pension Plan Number |  | 001 |  |
PPA Zone Status |  | Orange | Yellow |
FIP/RP Status |  | Implemented |  |
Contributions |  | $ 2,894 | $ 2,776 | 3,215
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 |  | $ 2,743 | $ 2,863 | 5,498
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 |  | $ 2,620 | $ 2,880 | 2,878
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 |  | $ 2,431 | $ 1,998 | 1,330
Sheet Metal Workers Pension Plan of Southern California, Arizona & Nevada |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
EIN |  | 956052257 |  |
Pension Plan Number |  | 001 |  |
PPA Zone Status |  | Red | Red |
FIP/RP Status |  | Implemented |  |
Contributions |  | $ 2,310 | $ 1,824 | 1,271
San Diego Electrical Pension Plan |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
EIN |  | 956101801 |  |
Pension Plan Number |  | 001 |  |
PPA Zone Status |  | Red | Green |
FIP/RP Status |  | Pending |  |
Contributions |  | $ 2,109 | $ 1,878 | 2,162
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 |  | $ 1,526 | $ 1,605 | 1,522
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 |  | $ 1,367 | $ 1,177 | 1,828
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 |  | $ 1,262 | $ 1,107 | 1,142
Building Trades United Pension Trust Fund Milwaukee and Vicinity |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
EIN |  | 516049409 |  |
Pension Plan Number |  | 001 |  |
PPA Zone Status |  | Yellow | Yellow |
FIP/RP Status |  | Implemented |  |
Contributions |  | $ 1,111 | $ 1,033 | 918
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 |  | $ 845 | $ 862 | 831
U.A. Local 467 Defined Benefit Plan |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
EIN |  | 942353807 |  |
Pension Plan Number |  | 005 |  |
PPA Zone Status |  | Red | Red |
FIP/RP Status |  | Implemented |  |
Contributions |  | $ 844 | $ 787 | 538
Plumbers & Pipefitters Local 162 Pension Fund |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
EIN |  | 316125999 |  |
Pension Plan Number |  | 001 |  |
PPA Zone Status |  | Red | Red |
FIP/RP Status | [1] | Implemented |  |
Contributions |  | $ 814 | $ 818 | 770
Other Multiemployer Pension Plans |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Contributions |  | $ 40,395 | $ 44,248 | $ 48,724
[1] | For these respective plans, a funding surcharge was currently in effect for 2015.

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