Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring, USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Assets:
Bank time deposits	$ 64,452	$ 114,839
U.S. and foreign government obligations	66,199
Commercial paper		75,066
Bankers' acceptances	8,865	8,630
Government bond-foreign		7,143
Foreign exchange contracts	14	215
Total Assets	139,530	205,893
Liabilities:
Foreign exchange contracts	531
Lease exit liabilities	15,427	14,938
Total Liabilities	15,958	14,938
Level 1
Assets:
U.S. and foreign government obligations	45,122
Total Assets	45,122
Level 2
Assets:
Bank time deposits	64,452	114,839
U.S. and foreign government obligations	21,077
Commercial paper		75,066
Bankers' acceptances	8,865	8,630
Government bond-foreign		7,143
Foreign exchange contracts	14	215
Total Assets	94,408	205,893
Liabilities:
Foreign exchange contracts	531
Total Liabilities	531
Level 3
Liabilities:
Lease exit liabilities	15,427	14,938
Total Liabilities	$ 15,427	$ 14,938