Restricted Cash and Term Deposits- Additional Information (Detail) (USD $) In Thousands, unless otherwise specified					9 Months Ended
Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Long-term deposits	Dec. 31, 2011 Long-term deposits	Sep. 30, 2012 Three Months Maturity Bank Time Deposits	Sep. 30, 2012 Twelve Months Maturity Bank Time Deposits
Schedule Of Deposits Assets Current And Noncurrent [Line Items]
Time deposits	$ 1,545				$ 548	$ 997
Time deposits original maturity period					3 months	12 months
Interest rate of time deposits					2.55%	2.95%
Provision for losses under client contracts	0	0
Deposit under employee loan programs	$ 674	$ 2,582	$ 380	$ 393

- Definition

Any certificate of deposit or savings account held by a bank or other financial institution for a short-term specified period of time. Because of their short-term, time deposits are considered highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References+ Details