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Revenue from Contracts with Customers - Schedule of Consolidated Balance Sheet and Statement of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current assets: |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ 363,907 |  |  |  | $ 467,430 |  |  |  | $ 363,907 | $ 467,430 |  |
Accounts receivable | 1,773,620 |  |  |  | 1,607,922 |  |  |  | 1,773,620 | 1,607,922 |  |
Contract assets | 158,243 |  |  |  | 122,621 |  |  |  | 158,243 | 122,621 | $ 130,697 |
Inventories | 42,321 |  |  |  | 42,724 |  |  |  | 42,321 | 42,724 |  |
Prepaid expenses and other | 48,116 |  |  |  | 43,812 |  |  |  | 48,116 | 43,812 |  |
Total current assets | 2,386,207 |  |  |  | 2,284,509 |  |  |  | 2,386,207 | 2,284,509 |  |
Investments, notes and other long-term receivables | 2,899 |  |  |  | 2,309 |  |  |  | 2,899 | 2,309 |  |
Property, plant and equipment, net | 134,351 |  |  |  | 127,156 |  |  |  | 134,351 | 127,156 |  |
Goodwill | 990,887 |  |  |  | 964,893 |  |  |  | 990,887 | 964,893 | 979,628 |
Identifiable intangible assets, net | 488,286 |  |  |  | 495,036 |  |  |  | 488,286 | 495,036 |  |
Other assets | 86,177 |  |  |  | 92,001 |  |  |  | 86,177 | 92,001 |  |
Total assets | 4,088,807 |  |  |  | 3,965,904 |  |  |  | 4,088,807 | 3,965,904 | 3,852,438 |
Current liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Current maturities of long-term debt and capital lease obligations | 16,013 |  |  |  | 15,364 |  |  |  | 16,013 | 15,364 |  |
Accounts payable | 652,091 |  |  |  | 567,840 |  |  |  | 652,091 | 567,840 |  |
Contract liabilities | 552,290 |  |  |  | 524,156 |  |  |  | 552,290 | 524,156 | 489,242 |
Accrued payroll and benefits | 343,069 |  |  |  | 322,865 |  |  |  | 343,069 | 322,865 |  |
Other accrued expenses and liabilities | 170,935 |  |  |  | 220,727 |  |  |  | 170,935 | 220,727 |  |
Total current liabilities | 1,734,398 |  |  |  | 1,650,952 |  |  |  | 1,734,398 | 1,650,952 |  |
Borrowings under revolving credit facility | 25,000 |  |  |  | 25,000 |  |  |  | 25,000 | 25,000 |  |
Long-term debt and capital lease obligations | 254,764 |  |  |  | 269,786 |  |  |  | 254,764 | 269,786 |  |
Other long-term obligations | 333,204 |  |  |  | 346,049 |  |  |  | 333,204 | 346,049 |  |
Total liabilities | 2,347,366 |  |  |  | 2,291,787 |  |  |  | 2,347,366 | 2,291,787 |  |
Total equity | 1,741,441 |  |  |  | 1,674,117 |  |  |  | 1,741,441 | 1,674,117 | 1,537,942 | $ 1,480,056
Total liabilities and equity | 4,088,807 |  |  |  | 3,965,904 |  |  |  | 4,088,807 | 3,965,904 |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues | 2,229,308 | $ 2,047,049 | $ 1,953,886 | $ 1,900,388 | 2,012,639 | $ 1,886,691 | $ 1,895,937 | $ 1,891,732 | 8,130,631 | 7,686,999 | 7,551,524 |
Cost of sales |  |  |  |  |  |  |  |  | 6,925,178 | 6,539,987 | 6,513,662 |
Gross profit | 336,151 | 309,339 | 290,844 | 269,119 | 311,101 | 295,070 | 274,501 | 266,340 | 1,205,453 | 1,147,012 | 1,037,862 |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 799,157 | 758,714 | 727,067 |
Restructuring expenses |  |  |  |  |  |  |  |  | 2,306 | 1,577 | 1,438 |
Impairment loss on goodwill and identifiable intangible assets | 0 | 0 | 907 | 0 | 57,819 | 0 | 0 | 0 | 907 | 57,819 | 2,428 |
Operating income |  |  |  |  |  |  |  |  | 403,083 | 328,902 | 306,929 |
Net periodic pension (cost) income |  |  |  |  |  |  |  |  | (2,743) | (1,652) | (1,529) |
Interest expense |  |  |  |  |  |  |  |  | (13,544) | (12,770) | (12,627) |
Interest income |  |  |  |  |  |  |  |  | 2,746 | 965 | 663 |
Income from continuing operations before income taxes |  |  |  |  |  |  |  |  | 395,028 | 318,749 | 296,494 |
Income tax provision |  |  |  |  |  |  |  |  | 109,106 | 90,699 | 111,199 |
Income from continuing operations |  |  |  |  |  |  |  |  | 285,922 | 228,050 | 185,295 |
Loss from discontinued operation, net of income taxes |  |  |  |  |  |  |  |  | (2,345) | (857) | (3,142) |
Net income including noncontrolling interests |  |  |  |  |  |  |  |  | 283,577 | 227,193 | 182,153 |
Less: Net (income) loss attributable to noncontrolling interests |  |  |  |  |  |  |  |  | (46) | 3 | (218) |
Net income attributable to EMCOR Group, Inc. | $ 77,968 | $ 79,373 | $ 70,816 | $ 55,374 | $ 53,201 | $ 64,597 | $ 56,758 | $ 52,640 | $ 283,531 | $ 227,196 | $ 181,935 |
Basic earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) | $ 1.39 | $ 1.37 | $ 1.22 | $ 0.95 | $ 0.91 | $ 1.10 | $ 0.96 | $ 0.89 | $ 4.92 | $ 3.85 | $ 3.05 |
Diluted earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) | $ 1.38 | $ 1.36 | $ 1.21 | $ 0.94 | $ 0.90 | $ 1.09 | $ 0.95 | $ 0.88 | $ 4.89 | $ 3.83 | $ 3.02 |
Pro Forma [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ 363,907 |  |  |  |  |  |  |  | $ 363,907 |  |  |
Accounts receivable | 1,778,930 |  |  |  |  |  |  |  | 1,778,930 |  |  |
Contract assets | 145,583 |  |  |  |  |  |  |  | 145,583 |  |  |
Inventories | 54,173 |  |  |  |  |  |  |  | 54,173 |  |  |
Prepaid expenses and other | 46,687 |  |  |  |  |  |  |  | 46,687 |  |  |
Total current assets | 2,389,280 |  |  |  |  |  |  |  | 2,389,280 |  |  |
Investments, notes and other long-term receivables | 2,899 |  |  |  |  |  |  |  | 2,899 |  |  |
Property, plant and equipment, net | 134,351 |  |  |  |  |  |  |  | 134,351 |  |  |
Goodwill | 990,887 |  |  |  |  |  |  |  | 990,887 |  |  |
Identifiable intangible assets, net | 488,286 |  |  |  |  |  |  |  | 488,286 |  |  |
Other assets | 86,177 |  |  |  |  |  |  |  | 86,177 |  |  |
Total assets | 4,091,880 |  |  |  |  |  |  |  | 4,091,880 |  |  |
Current liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Current maturities of long-term debt and capital lease obligations | 16,013 |  |  |  |  |  |  |  | 16,013 |  |  |
Accounts payable | 652,091 |  |  |  |  |  |  |  | 652,091 |  |  |
Contract liabilities | 511,089 |  |  |  |  |  |  |  | 511,089 |  |  |
Accrued payroll and benefits | 343,069 |  |  |  |  |  |  |  | 343,069 |  |  |
Other accrued expenses and liabilities | 219,166 |  |  |  |  |  |  |  | 219,166 |  |  |
Total current liabilities | 1,741,428 |  |  |  |  |  |  |  | 1,741,428 |  |  |
Borrowings under revolving credit facility | 25,000 |  |  |  |  |  |  |  | 25,000 |  |  |
Long-term debt and capital lease obligations | 254,764 |  |  |  |  |  |  |  | 254,764 |  |  |
Other long-term obligations | 333,204 |  |  |  |  |  |  |  | 333,204 |  |  |
Total liabilities | 2,354,396 |  |  |  |  |  |  |  | 2,354,396 |  |  |
Total equity | 1,737,484 |  |  |  |  |  |  |  | 1,737,484 |  |  |
Total liabilities and equity | $ 4,091,880 |  |  |  |  |  |  |  | 4,091,880 |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 8,117,087 |  |  |
Cost of sales |  |  |  |  |  |  |  |  | 6,918,281 |  |  |
Gross profit |  |  |  |  |  |  |  |  | 1,198,806 |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 799,157 |  |  |
Restructuring expenses |  |  |  |  |  |  |  |  | 2,306 |  |  |
Impairment loss on goodwill and identifiable intangible assets |  |  |  |  |  |  |  |  | 907 |  |  |
Operating income |  |  |  |  |  |  |  |  | 396,436 |  |  |
Net periodic pension (cost) income |  |  |  |  |  |  |  |  | (2,743) |  |  |
Interest expense |  |  |  |  |  |  |  |  | (13,544) |  |  |
Interest income |  |  |  |  |  |  |  |  | 2,746 |  |  |
Income from continuing operations before income taxes |  |  |  |  |  |  |  |  | 388,381 |  |  |
Income tax provision |  |  |  |  |  |  |  |  | 107,270 |  |  |
Income from continuing operations |  |  |  |  |  |  |  |  | 281,111 |  |  |
Loss from discontinued operation, net of income taxes |  |  |  |  |  |  |  |  | (2,345) |  |  |
Net income including noncontrolling interests |  |  |  |  |  |  |  |  | 278,766 |  |  |
Less: Net (income) loss attributable to noncontrolling interests |  |  |  |  |  |  |  |  | (46) |  |  |
Net income attributable to EMCOR Group, Inc. |  |  |  |  |  |  |  |  | $ 278,720 |  |  |
Basic earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) |  |  |  |  |  |  |  |  | $ 4.84 |  |  |
Diluted earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) |  |  |  |  |  |  |  |  | $ 4.81 |  |  |

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