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Investments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Current Assets:    
Available-for-sale securities $ 38,759 $ 115,553
Noncurrent Assets:    
Available-for-sale securities 5,304 15,391
Equity method investments 22,216 22,688
Cost method investments 4,092 6,841
Other investments 29,435 28,012
Total classified as non-current assets 61,047 72,932
Total $ 99,806 $ 188,485