FAIR VALUE MEASUREMENTS (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
ASSETS:
Short-term investments	$ 5,462,720	$ 3,646,845
LIABILITIES:
Redeemable noncontrolling interests	0	160,287
Foreign government securities
ASSETS:
Short-term investments	4,019,407	1,886,553
U.S. government securities
ASSETS:
Short-term investments	1,443,313	1,760,292
Recurring Basis | Level 2
ASSETS:
Foreign exchange derivatives	292	1,038
Total assets at fair value	5,463,012	3,647,883
LIABILITIES:
Foreign exchange derivatives	122,091	63,151
Total liabilities at fair value		63,151
Recurring Basis | Level 2 | Foreign government securities
ASSETS:
Short-term investments	4,019,407	1,886,553
Recurring Basis | Level 2 | U.S. government securities
ASSETS:
Short-term investments	1,443,313	1,760,292
Recurring Basis | Level 3
LIABILITIES:
Redeemable noncontrolling interests		160,287
Total liabilities at fair value		160,287
Recurring Basis | Total
ASSETS:
Foreign exchange derivatives	292	1,038
Total assets at fair value	5,463,012	3,647,883
LIABILITIES:
Foreign exchange derivatives	122,091	63,151
Redeemable noncontrolling interests		160,287
Total liabilities at fair value		223,438
Recurring Basis | Total | Foreign government securities
ASSETS:
Short-term investments	4,019,407	1,886,553
Recurring Basis | Total | U.S. government securities
ASSETS:
Short-term investments	$ 1,443,313	$ 1,760,292