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Schedule of Restricted Stock Unit Awards Aggregate Intrinsic Value (Detail) (Restricted Stock Units, USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Outstanding | $ 83,949 | $ 79,598 | $ 97,762
Expected to vest | $ 78,718 | $ 75,860 | $ 90,283

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