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Stock-Based Compensation - Summary of Unvested Service-Based Restricted Stock (Detail) (Service-Based Restricted Stock Units [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Service-Based Restricted Stock Units [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested restricted stock units, Beginning Balance 12,085
Assumed in SandForce acquisition,Number of Units 1,576
Granted,Number of Units 8,579
Vested,Number of Units (3,642)
Forfeited,Number of Units (943)
Unvested restricted stock units, Ending Balance 17,655
Unvested RSUs, Weighted-Average Grant Date Fair Value per Share, Beginning balance $ 5.94
Assumed in SandForce acquisition,Weighted-Average Grant Date Fair Value per Share $ 6.17
Granted,Weighted-Average Grant Date Fair Value per Share $ 8.11
Vested,Weighted-Average Grant Date Fair Value per Share $ 5.87
Forfeited,Weighted-Average Grant Date Fair Value per Share $ 6.60
Unvested RSUs, Weighted-Average Grant Date Fair Value per Share, Ending of period $ 6.99