Segment and Geographical Data - Performance of Operating Segments (Detail) - USD ($) $ in Millions |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2016 |
Oct. 02, 2016 |
Jul. 03, 2016 |
Apr. 03, 2016 |
Dec. 31, 2015 |
Sep. 27, 2015 |
Jun. 28, 2015 |
Mar. 29, 2015 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Segment Reporting Information [Line Items] | |||||||||||
| External Sales | $ 646.6 | $ 676.2 | $ 728.4 | $ 739.5 | $ 735.3 | $ 746.6 | $ 800.2 | $ 765.2 | $ 2,790.7 | $ 3,047.3 | $ 2,717.0 |
| Adjusted EBITDA | 493.0 | 538.2 | 478.6 | ||||||||
| Capital Expenditures | 194.5 | 226.3 | 156.4 | ||||||||
| Depreciation/Amortization | 221.3 | 229.8 | 210.8 | ||||||||
| Total Assets | 3,190.5 | 3,157.6 | 3,190.5 | 3,157.6 | 3,203.4 | ||||||
| Operating Segments [Member] | ASP HHI Holdings, Inc [Member] | |||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| External Sales | 834.9 | 984.8 | 968.5 | ||||||||
| Intersegment Sales | 8.1 | 8.9 | 9.0 | ||||||||
| Adjusted EBITDA | 161.2 | 199.8 | 193.5 | ||||||||
| Capital Expenditures | 55.9 | 69.9 | 61.6 | ||||||||
| Depreciation/Amortization | 77.0 | 79.1 | 76.9 | ||||||||
| Total Assets | 850.8 | 905.5 | 850.8 | 905.5 | 944.1 | ||||||
| Operating Segments [Member] | ASP MD Holdings, Inc [Member] | |||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| External Sales | 1,168.5 | 1,155.7 | 1,176.4 | ||||||||
| Intersegment Sales | 1.3 | 1.2 | 1.2 | ||||||||
| Adjusted EBITDA | 220.5 | 205.7 | 202.3 | ||||||||
| Capital Expenditures | 100.2 | 85.4 | 70.5 | ||||||||
| Depreciation/Amortization | 74.6 | 78.2 | 92.4 | ||||||||
| Total Assets | 1,286.2 | 1,243.8 | 1,286.2 | 1,243.8 | 1,216.4 | ||||||
| Operating Segments [Member] | ASP Grede Intermediate Holdings LLC [Member] | |||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| External Sales | 787.3 | 906.8 | 572.1 | ||||||||
| Intersegment Sales | 0.4 | 0.3 | |||||||||
| Adjusted EBITDA | 111.3 | 132.7 | 82.8 | ||||||||
| Capital Expenditures | 36.8 | 69.0 | 24.3 | ||||||||
| Depreciation/Amortization | 69.2 | 72.4 | 41.5 | ||||||||
| Total Assets | 945.5 | 954.6 | 945.5 | 954.6 | 982.0 | ||||||
| Intersegment Eliminations [Member] | |||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| Intersegment Sales | (9.8) | (10.4) | (10.2) | ||||||||
| Capital Expenditures | 1.6 | 2.0 | |||||||||
| Depreciation/Amortization | 0.5 | 0.1 | |||||||||
| Total Assets | $ 108.0 | $ 53.7 | $ 108.0 | $ 53.7 | $ 60.9 | ||||||