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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
		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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Three digit plan number for a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

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