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Financial Instruments - Cash and Cash Equivalents and Investments from Continuing Operations (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]        
Cash $ 85,781 $ 136,783    
Money market funds 80,140 103,776    
Cash and cash equivalents, unrestricted 165,921 240,559 209,277 280,592
Restricted cash 11,966 97,878    
Total cash and cash equivalents $ 177,887 $ 338,437