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Stock-Based Employee Compensation Plans - Additional Information With Respect to Restricted Stock Units and Performance Units (Parenthetical) (Detail)
12 Months Ended
Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Percentage of number of shares that may be earned related to performance units, Minimum 0.00%
Percentage of number of shares that may be earned related to performance units, Maximum 200.00%
Percentage of performance units earned as it relates to vested shares 132.60%
Number of performance units earned as it relates to vested shares 663,542