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Segment Reporting (Tables) | 6 Months Ended
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Jun. 30, 2019
Segment Reporting [Abstract] |
Summary of Financial Information Concerning Company's Reportable Segments | Summarized financial information concerning the Company’s reportable segments for the three and six months ended June 30, 2019 and 2018, is shown in the following tables: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended |  | ​ | ​ |  | Intercompany |  | Reported |  | Segment
June 30, 2019 | ​ | Revenue | ​ | Revenue(b) | ​ | Revenue | ​ | EBITDA(c)
Eastern | ​ | $ | 390,476 | ​ | $ | (66,855) | ​ | $ | 323,621 | ​ | $ | 85,048
Southern | ​ | ​ | 339,461 | ​ | ​ | (41,446) | ​ | ​ | 298,015 | ​ | ​ | 74,511
Western | ​ |  | 311,702 | ​ |  | (34,704) | ​ |  | 276,998 | ​ |  | 86,440
Central | ​ |  | 250,467 | ​ |  | (32,106) | ​ |  | 218,361 | ​ |  | 74,506
Canada | ​ |  | 216,306 | ​ |  | (27,779) | ​ |  | 188,527 | ​ |  | 67,664
E&P | ​ |  | 67,016 | ​ |  | (2,899) | ​ |  | 64,117 | ​ |  | 33,433
Corporate(a) | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (7,446)
​ | ​ | $ | 1,575,428 | ​ | $ | (205,789) | ​ | $ | 1,369,639 | ​ | $ | 414,156
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended |  | ​ | ​ |  | Intercompany |  | Reported |  | Segment
June 30, 2018 | ​ | Revenue | ​ | Revenue(b) | ​ | Revenue | ​ | EBITDA(c)
Eastern | ​ | $ | 320,404 | ​ | $ | (53,945) | ​ | $ | 266,459 | ​ | $ | 73,755
Southern | ​ | ​ | 321,051 | ​ | ​ | (37,941) | ​ | ​ | 283,110 | ​ | ​ | 68,787
Western | ​ |  | 295,730 | ​ |  | (32,031) | ​ |  | 263,699 | ​ |  | 81,175
Central | ​ |  | 207,209 | ​ |  | (27,705) | ​ |  | 179,504 | ​ |  | 64,172
Canada | ​ |  | 211,787 | ​ |  | (24,949) | ​ |  | 186,838 | ​ |  | 67,305
E&P | ​ |  | 61,765 | ​ |  | (1,407) | ​ |  | 60,358 | ​ |  | 31,231
Corporate(a) | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 260
​ | ​ | $ | 1,417,946 | ​ | $ | (177,978) | ​ | $ | 1,239,968 | ​ | $ | 386,685
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Six Months Ended |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
June 30, | ​ | ​ | ​ | ​ | Intercompany | ​ | Reported | ​ | Segment
2019 | ​ | Revenue | ​ | Revenue(b) | ​ | Revenue | ​ | EBITDA(c)
Eastern | ​ | $ | 737,323 | ​ | $ | (120,875) | ​ | $ | 616,448 | ​ | $ | 162,005
Southern | ​ | ​ | 663,942 | ​ | ​ | (78,599) | ​ | ​ | 585,343 | ​ | ​ | 148,889
Western | ​ |  | 597,877 | ​ |  | (65,900) | ​ |  | 531,977 | ​ |  | 163,444
Central | ​ |  | 453,260 | ​ |  | (57,022) | ​ |  | 396,238 | ​ |  | 137,534
Canada | ​ |  | 406,591 | ​ |  | (49,717) | ​ |  | 356,874 | ​ |  | 126,908
E&P | ​ |  | 133,050 | ​ |  | (5,655) | ​ |  | 127,395 | ​ |  | 65,042
Corporate(a) | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (11,304)
​ | ​ | $ | 2,992,043 | ​ | $ | (377,768) | ​ | $ | 2,614,275 | ​ | $ | 792,518
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Six Months Ended |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
June 30, | ​ | ​ | ​ | ​ | Intercompany | ​ | Reported | ​ | Segment
2018 | ​ | Revenue | ​ | Revenue(b) | ​ | Revenue | ​ | EBITDA(c)
Eastern | ​ | $ | 603,952 | ​ | $ | (99,905) | ​ | $ | 504,047 | ​ | $ | 140,040
Southern | ​ | ​ | 630,007 | ​ | ​ | (73,558) | ​ | ​ | 556,449 | ​ | ​ | 137,694
Western | ​ |  | 570,850 | ​ |  | (61,988) | ​ |  | 508,862 | ​ |  | 153,832
Central | ​ |  | 386,700 | ​ |  | (49,116) | ​ |  | 337,584 | ​ |  | 123,742
Canada | ​ |  | 403,475 | ​ |  | (46,662) | ​ |  | 356,813 | ​ |  | 126,571
E&P | ​ |  | 119,385 | ​ |  | (3,041) | ​ |  | 116,344 | ​ |  | 59,910
Corporate(a) | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (6,083)
​ | ​ | $ | 2,714,369 | ​ | $ | (334,270) | ​ | $ | 2,380,099 | ​ | $ | 735,706
____________________
| (a) | Corporate functions include accounting, legal, tax, treasury, information technology, risk management, human resources, training and other administrative functions. Amounts reflected are net of allocations to the six operating segments.
| (b) | Intercompany revenues reflect each segment’s total intercompany sales, including intercompany sales within a segment and between segments. Transactions within and between segments are generally made on a basis intended to reflect the market value of the service.
| (c) | For those items included in the determination of segment EBITDA, the accounting policies of the segments are the same as those described in the Company’s most recent Annual Report on Form 10-K.
Total Assets for Reportable Segments | Total assets for each of the Company’s reportable segments at June 30, 2019 and December 31, 2018, were as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ |  | 2019 |  | 2018
Eastern | ​ | $ | 2,720,643 | ​ | $ | 2,673,316
Southern |  | ​ | 2,965,048 |  | ​ | 2,892,994
Western | ​ | ​ | 1,680,268 | ​ | ​ | 1,596,129
Central | ​ | ​ | 1,880,010 | ​ | ​ | 1,506,326
Canada | ​ | ​ | 2,496,286 | ​ | ​ | 2,412,971
E&P | ​ | ​ | 974,023 | ​ | ​ | 969,808
Corporate | ​ | ​ | 429,494 | ​ | ​ | 575,785
Total Assets |  | $ | 13,145,772 |  | $ | 12,627,329
Changes in Goodwill by Reportable Segment | The following tables show changes in goodwill during the six months ended June 30, 2019 and 2018, by reportable segment: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Eastern |  | Southern |  | Western |  | Central |  | Canada |  | E&P |  | Total
Balance as of December 31, 2018 | ​ | $ | 1,143,355 | ​ | $ | 1,517,610 | ​ | $ | 398,174 | ​ | $ | 523,566 | ​ | $ | 1,448,980 | ​ | $ | — | ​ | $ | 5,031,685
Goodwill transferred | ​ | ​ | (16,869) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 16,869 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Goodwill acquired | ​ |  | 25,294 | ​ |  | 7,726 | ​ | ​ | 1,122 | ​ |  | 190,383 | ​ | ​ | — | ​ | ​ | — | ​ |  | 224,525
Goodwill acquisition adjustments | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (173) | ​ | ​ | — | ​ | ​ | (173)
Goodwill divested | ​ |  | — | ​ |  | (845) | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (845)
Impact of changes in foreign currency | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 61,478 | ​ |  | — | ​ |  | 61,478
Balance as of June 30, 2019 | ​ | $ | 1,151,780 | ​ | $ | 1,524,491 | ​ | $ | 399,296 | ​ | $ | 730,818 | ​ | $ | 1,510,285 | ​ | $ | — | ​ | $ | 5,316,670
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Eastern |  | Southern |  | Western |  | Central |  | Canada |  | E&P |  | Total
Balance as of December 31, 2017 | ​ | $ | 804,133 | ​ | $ | 1,436,320 | ​ | $ | 397,508 | ​ | $ | 468,275 | ​ | $ | 1,575,538 | ​ | $ | — | ​ | $ | 4,681,774
Goodwill transferred | ​ | ​ | (16,869) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 16,869 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Goodwill acquired | ​ |  | 120,979 | ​ |  | 4,909 | ​ |  | 666 | ​ |  | 39,155 | ​ |  | — | ​ |  | — | ​ |  | 165,709
Impact of changes in foreign currency | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (74,517) | ​ |  | — | ​ |  | (74,517)
Balance as of June 30, 2018 | ​ | $ | 908,243 | ​ | $ | 1,441,229 | ​ | $ | 398,174 | ​ | $ | 524,299 | ​ | $ | 1,501,021 | ​ | $ | — | ​ | $ | 4,772,966
Reconciliation of Primary Measure of Segment Profitability to Income Before Income Tax Provision | A reconciliation of the Company’s primary measure of segment profitability (segment EBITDA) to Income before income tax provision in the Condensed Consolidated Statements of Net Income is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended | ​
​ | ​ | June 30, | ​ | June 30, | ​
​ |  | 2019 |  | 2018 |  | 2019 |  | 2018 |
Eastern segment EBITDA | ​ | $ | 85,048 | ​ | $ | 73,755 | ​ | $ | 162,005 | ​ | $ | 140,040 | ​
Southern segment EBITDA | ​ | ​ | 74,511 | ​ | ​ | 68,787 | ​ | ​ | 148,889 | ​ | ​ | 137,694 | ​
Western segment EBITDA | ​ |  | 86,440 | ​ |  | 81,175 | ​ |  | 163,444 | ​ |  | 153,832 | ​
Central segment EBITDA | ​ |  | 74,506 | ​ |  | 64,172 | ​ |  | 137,534 | ​ |  | 123,742 | ​
Canada segment EBITDA | ​ |  | 67,664 | ​ |  | 67,305 | ​ |  | 126,908 | ​ |  | 126,571 | ​
E&P segment EBITDA | ​ |  | 33,433 | ​ |  | 31,231 | ​ |  | 65,042 | ​ |  | 59,910 | ​
Subtotal reportable segments | ​ |  | 421,602 | ​ |  | 386,425 | ​ |  | 803,822 | ​ |  | 741,789 | ​
Unallocated corporate overhead | ​ |  | (7,446) | ​ |  | 260 | ​ |  | (11,304) | ​ |  | (6,083) | ​
Depreciation | ​ |  | (156,776) | ​ |  | (142,450) | ​ |  | (303,623) | ​ |  | (275,634) | ​
Amortization of intangibles | ​ |  | (31,344) | ​ |  | (26,474) | ​ |  | (61,886) | ​ |  | (52,573) | ​
Impairments and other operating items | ​ |  | (3,902) | ​ |  | (7,073) | ​ |  | (20,014) | ​ |  | (8,104) | ​
Interest expense | ​ |  | (37,245) | ​ |  | (32,426) | ​ |  | (74,533) | ​ |  | (64,796) | ​
Interest income | ​ |  | 1,818 | ​ |  | 1,056 | ​ |  | 5,129 | ​ |  | 2,210 | ​
Other income, net | ​ |  | 805 | ​ |  | 2,031 | ​ |  | 3,363 | ​ |  | 1,644 | ​
Foreign currency transaction gain (loss) | ​ |  | 1,115 | ​ |  | 30 | ​ |  | 1,218 | ​ |  | (190) | ​
Income before income tax provision | ​ | $ | 188,627 | ​ | $ | 181,379 | ​ | $ | 342,172 | ​ | $ | 338,263 | ​
​

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8721-108599 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8906-108599 + Details
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