FAIR VALUE MEASUREMENTS (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
ASSETS:
Short-term investments	$ 3,646,845	$ 2,024,827
LIABILITIES:
Redeemable noncontrolling interests	160,287	127,045
Foreign government securities
ASSETS:
Short-term investments	1,886,553	1,074,186
U.S. government securities
ASSETS:
Short-term investments	1,760,292	923,322
U.S. agency securities
ASSETS:
Short-term investments		26,951
U.S. corporate notes
ASSETS:
Short-term investments		368
Recurring Basis | Level 2
ASSETS:
Foreign exchange derivatives	1,038	60,455
Total assets at fair value	3,647,883	2,085,282
LIABILITIES:
Foreign exchange derivatives	63,151	1,107
Total liabilities at fair value	63,151	1,107
Recurring Basis | Level 2 | Foreign government securities
ASSETS:
Short-term investments	1,886,553	1,074,186
Recurring Basis | Level 2 | U.S. government securities
ASSETS:
Short-term investments	1,760,292	923,322
Recurring Basis | Level 2 | U.S. agency securities
ASSETS:
Short-term investments		26,951
Recurring Basis | Level 2 | U.S. corporate notes
ASSETS:
Short-term investments		368
Recurring Basis | Level 3
LIABILITIES:
Redeemable noncontrolling interests	160,287	127,045
Total liabilities at fair value	160,287	127,045
Recurring Basis | Total
ASSETS:
Foreign exchange derivatives	1,038	60,455
Total assets at fair value	3,647,883	2,085,282
LIABILITIES:
Foreign exchange derivatives	63,151	1,107
Redeemable noncontrolling interests	160,287	127,045
Total liabilities at fair value	223,438	128,152
Recurring Basis | Total | Foreign government securities
ASSETS:
Short-term investments	1,886,553	1,074,186
Recurring Basis | Total | U.S. government securities
ASSETS:
Short-term investments	1,760,292	923,322
Recurring Basis | Total | U.S. agency securities
ASSETS:
Short-term investments		26,951
Recurring Basis | Total | U.S. corporate notes
ASSETS:
Short-term investments		$ 368