Segment Reporting - Additional Information (Detail) - Segment |
6 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|
Oct. 31, 2016 |
Jan. 01, 2016 |
Jul. 01, 2015 |
Jun. 30, 2016 |
Dec. 31, 2016 |
|
| Segment Reporting Information [Line Items] | |||||
| Number of reportable segments | 4 | ||||
| Alternate Economic Interest In Subsidiary Subject To Performance Hurdles | 100.00% | ||||
| Vermillion | |||||
| Segment Reporting Information [Line Items] | |||||
| Percentage of economic interest | 55.00% | 88.00% | |||
| Revised ownership interest percentage | 63.00% | 55.00% | |||
| Emerging Sovereign Group LLC | |||||
| Segment Reporting Information [Line Items] | |||||
| Percentage of economic interest | 55.00% | 55.00% | 55.00% |