Restricted Cash and Time Deposits - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Dec. 31, 2012
Schedule Of Deposits Assets Current And Noncurrent [Line Items]
Time deposits	$ 1,562	$ 1,006
Provision for losses under client contracts	0	0
Deposit under employee loan programs	356	467
Noncurrent Assets
Schedule Of Deposits Assets Current And Noncurrent [Line Items]
Deposit under employee loan programs	356	360
Bank Time Deposits
Schedule Of Deposits Assets Current And Noncurrent [Line Items]
Time deposits	551
Time deposits original maturity date	April 9, 2013
Interest rate of time deposits	2.10%
Time Deposits
Schedule Of Deposits Assets Current And Noncurrent [Line Items]
Time deposits	$ 1,003	$ 1,006
Time deposits original maturity date	September 27, 2013
Interest rate of time deposits	2.95%

- 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.

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