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Financial Instruments - Cash and Cash Equivalents and Investments from Continuing Operations (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Cash And Cash Equivalents [Abstract]
Cash	$ 175,739	$ 155,756
Corporate bonds	1,006
Money market funds	87,443	163,005
Cash and cash equivalents, unrestricted	264,188	318,761	109,403	112,697
Restricted cash	12,948	12,564
Total cash and cash equivalents	$ 277,136	$ 331,325

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

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