Unconsolidated Investments - Additional Information (Detail) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended |
|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2016 |
|
| Equity Method Investments and Joint Ventures [Abstract] | ||
| Gains on distributions from unconsolidated investments | $ 5,777 | $ 15,017 |
| Suspended equity losses | 2,662 | 4,556 |
| Suspended other comprehensive income | $ (535) | $ (659) |