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INVESTMENTS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 12, 2016
Dec. 11, 2015
May 26, 2015
Aug. 07, 2014
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jul. 17, 2018
Jan. 01, 2018
Dec. 31, 2017
Schedule of Investments [Line Items]                      
Net unrealized gains reclassified from AOCI to retained earnings, net of tax         $ 188,539   $ 188,539        
Net unrealized gains on marketable equity securities         21,849 $ 0 76,363 $ 0      
Marketable securities:                      
Short-term investments in marketable securities         4,145,753   $ 4,145,753       $ 4,859,873
Investments [Abstract]                      
Weighted average life of all fixed income investments, excluding the Company's investment in Ctrip convertible debt securities             1 year 5 months        
Investment in equity securities         450,900   $ 450,900        
Investment in equity securities                     450,900
Ctrip.com International, Ltd.                      
Investments [Abstract]                      
Debt investment term 6 years 10 years 5 years 5 years              
Maximum ownership percentage in Ctrip     15.00%                
Meituan-Dianping                      
Investments [Abstract]                      
Investment in equity securities         450,000   450,000        
Didi Chuxing | Subsequent Event                      
Investments [Abstract]                      
Investment in equity securities                 $ 500,000    
Short-term Investments                      
Marketable securities:                      
Cost         4,163,199   4,163,199        
Gross Unrealized Gains         256   256        
Gross Unrealized Losses         (17,702)   (17,702)        
Short-term investments in marketable securities         4,145,753   4,145,753        
Available-for-sale securities:                      
Cost                     4,866,475
Gross Unrealized Gains                     700
Gross Unrealized Losses                     (7,302)
Fair Value                     4,859,873
Short-term Investments | International government securities                      
Debt securities:                      
Cost         409,205   409,205        
Gross Unrealized Gains         18   18        
Gross Unrealized Losses         (341)   (341)        
Fair Value         408,882   408,882        
Available-for-sale securities:                      
Cost                     725,566
Gross Unrealized Gains                     246
Gross Unrealized Losses                     (436)
Fair Value                     725,376
Short-term Investments | U.S. government securities                      
Debt securities:                      
Cost         873,082   873,082        
Gross Unrealized Gains         2   2        
Gross Unrealized Losses         (3,875)   (3,875)        
Fair Value         869,209   869,209        
Available-for-sale securities:                      
Cost                     996,112
Gross Unrealized Gains                     5
Gross Unrealized Losses                     (1,999)
Fair Value                     994,118
Short-term Investments | Corporate debt securities                      
Debt securities:                      
Cost         2,837,177   2,837,177        
Gross Unrealized Gains         236   236        
Gross Unrealized Losses         (13,466)   (13,466)        
Fair Value         2,823,947   2,823,947        
Available-for-sale securities:                      
Cost                     3,067,703
Gross Unrealized Gains                     449
Gross Unrealized Losses                     (4,837)
Fair Value                     3,063,315
Short-term Investments | U.S. government agency securities                      
Debt securities:                      
Cost         4,926   4,926        
Gross Unrealized Gains         0   0        
Gross Unrealized Losses         (20)   (20)        
Fair Value         4,906   4,906        
Available-for-sale securities:                      
Cost                     4,444
Gross Unrealized Gains                     0
Gross Unrealized Losses                     (30)
Fair Value                     4,414
Short-term Investments | Commercial paper                      
Debt securities:                      
Cost         37,808   37,808        
Gross Unrealized Gains         0   0        
Gross Unrealized Losses         0   0        
Fair Value         37,808   37,808        
Available-for-sale securities:                      
Cost                     72,650
Gross Unrealized Gains                     0
Gross Unrealized Losses                     0
Fair Value                     72,650
Short-term Investments | Certificate of deposit                      
Debt securities:                      
Cost         1,001   1,001        
Gross Unrealized Gains         0   0        
Gross Unrealized Losses         0   0        
Fair Value         1,001   1,001        
Long-term Investments                      
Marketable securities:                      
Cost         8,564,174   8,564,174        
Gross Unrealized Gains         512,980   512,980        
Gross Unrealized Losses         (83,155)   (83,155)        
Long-term investments         8,993,999   8,993,999        
Available-for-sale securities:                      
Cost                     10,072,468
Gross Unrealized Gains                     412,786
Gross Unrealized Losses                     (63,654)
Fair Value                     10,421,600
Long-term Investments | International government securities                      
Debt securities:                      
Cost         805,579   805,579        
Gross Unrealized Gains         3,903   3,903        
Gross Unrealized Losses         (191)   (191)        
Fair Value         809,291   809,291        
Available-for-sale securities:                      
Cost                     607,000
Gross Unrealized Gains                     1,588
Gross Unrealized Losses                     (678)
Fair Value                     607,910
Long-term Investments | U.S. government securities                      
Debt securities:                      
Cost         467,280   467,280        
Gross Unrealized Gains         7   7        
Gross Unrealized Losses         (10,947)   (10,947)        
Fair Value         456,340   456,340        
Available-for-sale securities:                      
Cost                     844,910
Gross Unrealized Gains                     2
Gross Unrealized Losses                     (10,636)
Fair Value                     834,276
Long-term Investments | Corporate debt securities                      
Debt securities:                      
Cost         5,361,004   5,361,004        
Gross Unrealized Gains         8,484   8,484        
Gross Unrealized Losses         (67,317)   (67,317)        
Fair Value         5,302,171   5,302,171        
Available-for-sale securities:                      
Cost                     6,689,747
Gross Unrealized Gains                     8,399
Gross Unrealized Losses                     (41,722)
Fair Value                     6,656,424
Long-term Investments | U.S. government agency securities                      
Available-for-sale securities:                      
Cost                     500
Gross Unrealized Gains                     0
Gross Unrealized Losses                     (6)
Fair Value                     494
Long-term Investments | Convertible debt securities | Ctrip.com International, Ltd.                      
Debt securities:                      
Cost $ 25,000 $ 500,000 $ 250,000 $ 500,000 1,275,000   1,275,000        
Gross Unrealized Gains         125,538   125,538        
Gross Unrealized Losses         (4,700)   (4,700)        
Fair Value         1,395,838   1,395,838        
Available-for-sale securities:                      
Cost                     1,275,000
Gross Unrealized Gains                     103,100
Gross Unrealized Losses                     (9,600)
Fair Value                     1,368,500
Long-term Investments | Equity securities | Ctrip.com International, Ltd.                      
Investments in Ctrip:                      
Cost         655,311   655,311        
Gross Unrealized Gains         375,048   375,048        
Gross Unrealized Losses         0   0        
Fair Value         1,030,359   1,030,359        
Available-for-sale securities:                      
Cost                     655,311
Gross Unrealized Gains                     299,697
Gross Unrealized Losses                     (1,012)
Fair Value                     $ 953,996
Accumulated Other Comprehensive Income (Loss)                      
Schedule of Investments [Line Items]                      
Net unrealized gains reclassified from AOCI to retained earnings, net of tax         (241,088)   (241,088)        
Retained Earnings                      
Schedule of Investments [Line Items]                      
Net unrealized gains reclassified from AOCI to retained earnings, net of tax         $ 429,627   $ 429,627        
Accounting Standards Update 2016-01 | Accumulated Other Comprehensive Income (Loss)                      
Schedule of Investments [Line Items]                      
Net unrealized gains reclassified from AOCI to retained earnings, net of tax                   $ (241,088)  
Accounting Standards Update 2016-01 | Retained Earnings                      
Schedule of Investments [Line Items]                      
Net unrealized gains reclassified from AOCI to retained earnings, before tax                   298,700  
Net unrealized gains reclassified from AOCI to retained earnings, net of tax                   $ 241,100