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INVESTMENTS - Summary of Investments in Nonconsolidated Affiliates and Available-for-sale Securities (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Investments in and Advances to Affiliates, at Fair Value |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 118,507 |  |  |  | $ 87,990 | $ 118,507 | $ 87,990 |
Cash contributions |  |  |  |  |  |  |  |  | 1,051 | 2,248 |
Acquisitions |  |  |  |  |  |  |  |  | 23,358 | 35,523 |
Equity in loss | $ 729 | $ 172 | $ (38) | 157 | $ (615) | $ (2,238) | $ 240 | (242) | 1,020 | (2,855) | $ (16,733)
Disposals |  |  |  |  |  |  |  |  | (29,587) | (816) |
Foreign currency translation adjustment |  |  |  |  |  |  |  |  | (352) | 768 |
Distributions received |  |  |  |  |  |  |  |  | (2,500) | (775) |
Impairment of investments |  |  |  |  |  |  |  |  | (16,434) | (4,873) |
Unrealized holding loss on marketable securities |  |  |  |  |  |  |  |  | 3,818 | (414) |
Other |  |  |  |  |  |  |  |  |  | 1,711 |
Ending balance | 98,881 |  |  |  | 118,507 |  |  |  | 98,881 | 118,507 | 87,990
Notes Receivable |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 13,792 |  |  |  | 132 | 13,792 | 132 |
Cash contributions |  |  |  |  |  |  |  |  | 0 | 0 |
Acquisitions |  |  |  |  |  |  |  |  | 15,076 | 13,602 |
Equity in loss |  |  |  |  |  |  |  |  | 0 | 0 |
Disposals |  |  |  |  |  |  |  |  | (728) | (188) |
Foreign currency translation adjustment |  |  |  |  |  |  |  |  | 0 | 0 |
Distributions received |  |  |  |  |  |  |  |  | 0 | 0 |
Impairment of investments |  |  |  |  |  |  |  |  | (2,064) | (671) |
Unrealized holding loss on marketable securities |  |  |  |  |  |  |  |  | 0 | 0 |
Other |  |  |  |  |  |  |  |  |  | 917 |
Ending balance | 26,076 |  |  |  | 13,792 |  |  |  | 26,076 | 13,792 | 132
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 24,395 |  |  |  | 14,477 | 24,395 | 14,477 |
Cash contributions |  |  |  |  |  |  |  |  | 1,051 | 2,248 |
Acquisitions |  |  |  |  |  |  |  |  | 3,732 | 10,361 |
Equity in loss |  |  |  |  |  |  |  |  | 1,020 | (2,855) |
Disposals |  |  |  |  |  |  |  |  | (33) | 0 |
Foreign currency translation adjustment |  |  |  |  |  |  |  |  | (29) | 145 |
Distributions received |  |  |  |  |  |  |  |  | (2,500) | (775) |
Impairment of investments |  |  |  |  |  |  |  |  | 0 | 0 |
Unrealized holding loss on marketable securities |  |  |  |  |  |  |  |  | 0 | 0 |
Other |  |  |  |  |  |  |  |  |  | 794 |
Ending balance | 27,636 |  |  |  | 24,395 |  |  |  | 27,636 | 24,395 | 14,477
Other Investments |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 78,776 |  |  |  | 71,666 | 78,776 | 71,666 |
Cash contributions |  |  |  |  |  |  |  |  | 0 | 0 |
Acquisitions |  |  |  |  |  |  |  |  | 4,550 | 11,560 |
Equity in loss |  |  |  |  |  |  |  |  | 0 | 0 |
Disposals |  |  |  |  |  |  |  |  | (28,826) | (628) |
Foreign currency translation adjustment |  |  |  |  |  |  |  |  | (256) | 380 |
Distributions received |  |  |  |  |  |  |  |  | 0 | 0 |
Impairment of investments |  |  |  |  |  |  |  |  | (14,370) | (4,202) |
Unrealized holding loss on marketable securities |  |  |  |  |  |  |  |  | 4,389 | 0 |
Other |  |  |  |  |  |  |  |  |  | 0 |
Ending balance | 44,263 |  |  |  | 78,776 |  |  |  | 44,263 | 78,776 | 71,666
Marketable Equity Securities |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 1,544 |  |  |  | $ 1,715 | 1,544 | 1,715 |
Cash contributions |  |  |  |  |  |  |  |  | 0 | 0 |
Acquisitions |  |  |  |  |  |  |  |  | 0 | 0 |
Equity in loss |  |  |  |  |  |  |  |  | 0 | 0 |
Disposals |  |  |  |  |  |  |  |  | 0 | 0 |
Foreign currency translation adjustment |  |  |  |  |  |  |  |  | (67) | 243 |
Distributions received |  |  |  |  |  |  |  |  | 0 | 0 |
Impairment of investments |  |  |  |  |  |  |  |  | 0 | 0 |
Unrealized holding loss on marketable securities |  |  |  |  |  |  |  |  | (571) | (414) |
Other |  |  |  |  |  |  |  |  |  | 0 |
Ending balance | $ 906 |  |  |  | $ 1,544 |  |  |  | $ 906 | $ 1,544 | $ 1,715

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