Fair value measurements - Percentages of Total Commodity Sales Excluding Effects of Hedging Activities (Detail) - Predecessor - Customer Concentration Risk - Commodity Sales |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Coffeyville Resources LLC | |||
| Counterparty Credit Risk | |||
| Percentage of sales to significant purchaser | 19.30% | 14.50% | 14.00% |
| Valero Energy Corporation | |||
| Counterparty Credit Risk | |||
| Percentage of sales to significant purchaser | 15.60% | 20.70% | 23.70% |
| Phillips 66 Company | |||
| Counterparty Credit Risk | |||
| Percentage of sales to significant purchaser | 15.10% | 11.80% | |