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Investments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Current assets:    
Available-for-sale securities $ 46,698 $ 23,874
Noncurrent Assets:    
Available-for-sale securities 5,662 5,718
Equity method investments 21,402 22,021
Cost method investments 10,092 10,092
Other investments 32,746 33,251
Total classified as non-current assets 69,902 71,082
Total $ 116,600 $ 94,956