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Financial Instruments - Cash and Cash Equivalents and Investments from Continuing Operations (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Cash And Cash Equivalents [Abstract]        
Cash $ 131,546 $ 155,466    
Cash equivalents 7,062 163,005    
Cash and cash equivalents, unrestricted 138,608 318,471 63,732 112,415
Restricted cash 11,929 12,564    
Total cash and cash equivalents $ 150,537 $ 331,035