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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenues (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017 | Dec. 31, 2017 | Dec. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | $ 682,405,000 | $ 712,737,000 | $ 1,381,089,000 | $ 1,350,210,000 |  |
Contract asset, current | 92,585,000 |  | 92,585,000 |  | $ 51,507,000 |
Contract with customer, liability, current | 4,669 |  | 4,669 |  |  | $ 7,368
Revenue recognized from contract liability |  |  | 4,000 |  |  |
Transferred at Point in Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 474,740,000 |  | 952,025,000 |  |  |
Transferred over Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 207,665,000 |  | 429,064,000 |  |  |
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 | 196,531,000 | 209,622,000 | 406,390,000 | 409,652,000 |  |
Utility Support Structures Segment | Transferred at Point in Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  | 0 |  |  |
Utility Support Structures Segment | Transferred over Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 196,531,000 |  | 406,390,000 |  |  |
Engineered Support Structures Segment |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 246,041,000 | 231,278,000 | 461,957,000 | 424,354,000 |  |
Engineered Support Structures Segment | Transferred at Point in Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 237,720,000 |  | 444,914,000 |  |  |
Engineered Support Structures Segment | Transferred over Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 8,321,000 |  | 17,043,000 |  |  |
Coatings Segment |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 74,539,000 | 64,600,000 | 142,997,000 | 123,932,000 |  |
Coatings Segment | Transferred at Point in Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 74,539,000 |  | 142,997,000 |  |  |
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 | 160,613,000 | $ 186,165,000 | 346,665,000 | $ 351,606,000 |  |
Irrigation Segment | Transferred at Point in Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 157,800,000 |  | 341,034,000 |  |  |
Irrigation Segment | Transferred over Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 2,813,000 |  | 5,631,000 |  |  |
Other Segments | Transferred at Point in Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 4,681,000 |  | 23,080,000 |  |  |
Other Segments | Transferred over Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | $ 0 |  | $ 0 |  |  |

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