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Stock-Based Compensation Expense Recognized in Condensed Consolidated Statements of Operations (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation $ (4,827) $ 15,943 $ 46,755 $ 31,304