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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation $ 40,644 $ 10,172 $ 51,583 $ 15,362