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SEGMENT INFORMATION - Summary of Segment Results (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
TOTAL ASSETS | $ 5,932,183 |  | $ 5,932,183 |  | $ 5,804,254
Summarized Information |  |  |  |  |
Net sales to external customers | 2,831,429 | $ 2,635,999 | 8,458,042 | $ 7,792,397 |
Total consolidated operating earnings | 189,122 | 277,738 | 867,938 | 799,319 |
United States [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
TOTAL ASSETS | 2,515,137 |  | 2,515,137 |  | 2,309,734
Summarized Information |  |  |  |  |
Net sales to external customers | 2,073,317 | 1,912,301 | 6,133,204 | 5,671,318 |
Canada [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
TOTAL ASSETS | 213,525 |  | 213,525 |  | 278,633
Summarized Information |  |  |  |  |
Net sales to external customers | 149,760 | 188,203 | 508,359 | 563,455 |
Other Businesses [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
TOTAL ASSETS | 672,854 |  | 672,854 |  | 605,452
Summarized Information |  |  |  |  |
Net sales to external customers | 608,352 | 535,495 | 1,816,479 | 1,557,624 |
Segment Balances Before Intersegment Eliminations and Consolidation Reconciling Items [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
TOTAL ASSETS | 3,401,516 |  | 3,401,516 |  | $ 3,193,819
Summarized Information |  |  |  |  |
Net sales to external customers | 2,947,423 | 2,741,111 | 8,799,092 | 8,092,929 |
Total consolidated operating earnings | 222,391 | 306,523 | 972,107 | 898,454 |
Segment Balances Before Intersegment Eliminations and Consolidation Reconciling Items [Member] | United States [Member] |  |  |  |  |
Summarized Information |  |  |  |  |
Net sales to external customers | 2,188,324 | 2,015,968 | 6,471,116 | 5,968,565 |
Total consolidated operating earnings | 326,273 | 294,603 | 1,032,491 | 913,705 |
Segment Balances Before Intersegment Eliminations and Consolidation Reconciling Items [Member] | Canada [Member] |  |  |  |  |
Summarized Information |  |  |  |  |
Net sales to external customers | 149,782 | 188,216 | 508,414 | 563,470 |
Total consolidated operating earnings | (4,051) | (14,972) | (37,875) | (59,428) |
Segment Balances Before Intersegment Eliminations and Consolidation Reconciling Items [Member] | Other Businesses [Member] |  |  |  |  |
Summarized Information |  |  |  |  |
Net sales to external customers | 609,317 | 536,927 | 1,819,562 | 1,560,894 |
Total consolidated operating earnings | (99,831) | 26,892 | (22,509) | 44,177 |
Intersegment Eliminations [Member] |  |  |  |  |
Summarized Information |  |  |  |  |
Net sales to external customers | (115,994) | (105,112) | (341,050) | (300,532) |
Intersegment Eliminations [Member] | United States [Member] |  |  |  |  |
Summarized Information |  |  |  |  |
Net sales to external customers | (115,007) | (103,667) | (337,912) | (297,247) |
Intersegment Eliminations [Member] | Canada [Member] |  |  |  |  |
Summarized Information |  |  |  |  |
Net sales to external customers | (22) | (13) | (55) | (15) |
Intersegment Eliminations [Member] | Other Businesses [Member] |  |  |  |  |
Summarized Information |  |  |  |  |
Net sales to external customers | $ (965) | $ (1,432) | $ (3,083) | $ (3,270) |

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