INVESTMENTS - Net Gains from Investment Activities (Detail) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Equity Method Investments and Joint Ventures [Abstract] | ||||
| Realized gains (losses) on sales of investments | $ 472 | $ 33 | $ 375 | $ 187 |
| Net change in unrealized gains (losses) due to changes in fair value(1) | 17,274 | 80,917 | 49,912 | 107,305 |
| Net gains (losses) from investment activities | $ 17,746 | $ 80,950 | $ 50,287 | $ 107,492 |