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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenues (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 29, 2018 | Sep. 30, 2017 | Sep. 29, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | $ 678,692,000 | $ 680,779,000 | $ 2,059,781,000 | $ 2,030,989,000 |  |
Contract asset, current | 112,620,000 |  | 112,620,000 |  | $ 67,672,000 | $ 16,165,000
Contract with customer, liability, current | 5,088 |  | 5,088 |  |  | 7,368
Revenue recognized from contract liability |  |  | 4,456,000 |  |  |
Transferred at Point in Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 451,295,000 |  | 1,403,321,000 |  |  |
Transferred over Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 227,397,000 |  | 656,460,000 |  |  |
Offshore and Other Complex Steel Structures |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Contract asset, current |  |  |  |  |  | $ 16,165,000
Utility Support Structures Segment |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 217,943,000 | 203,574,000 | 624,333,000 | 613,226,000 |  |
Utility Support Structures Segment | Transferred at Point in Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 6,090,000 |  | 6,090,000 |  |  |
Utility Support Structures Segment | Transferred over Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 211,853,000 |  | 618,243,000 |  |  |
Engineered Support Structures Segment |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 248,431,000 | 244,675,000 | 710,388,000 | 669,029,000 |  |
Engineered Support Structures Segment | Transferred at Point in Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 235,948,000 |  | 680,863,000 |  |  |
Engineered Support Structures Segment | Transferred over Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 12,483,000 |  | 29,525,000 |  |  |
Coatings Segment |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 74,547,000 | 67,680,000 | 217,544,000 | 191,612,000 |  |
Coatings Segment | Transferred at Point in Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 74,547,000 |  | 217,544,000 |  |  |
Coatings Segment | Transferred over Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  | 0 |  |  |
Irrigation Segment |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 137,771,000 | $ 145,050,000 | 484,436,000 | $ 496,656,000 |  |
Irrigation Segment | Transferred at Point in Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 134,710,000 |  | 475,744,000 |  |  |
Irrigation Segment | Transferred over Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 3,061,000 |  | 8,692,000 |  |  |
Other Segments | Transferred at Point in Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  | 23,080,000 |  |  |
Other Segments | Transferred over Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  | 0 |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 12,597,000 |  | 34,860,000 |  |  |
Contract asset, current | $ 86,251,000 |  | $ 86,251,000 |  | $ 51,507,000 |

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