SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Cash Flows (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents
Cash and cash equivalents	$ 65,641	$ 90,058	$ 165,062	$ 191,218
Restricted cash	9,138	20,821	16,226	6,677
Pledged cash and cash equivalents (NOTE 10)	5,361	9,469	40,325	88,785
Total cash, cash equivalents, restricted cash, and restricted cash equivalents	$ 80,140	$ 120,348	$ 221,613	$ 286,680