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Summary of Restricted Stock Unit and Performance Share Transaction (Detail)
 12 Months Ended
Dec. 31, 2013
Restricted stock units
  
Number of Shares  
Outstanding beginning balance 669,459
Granted 320,318
Distributed (vested) (207,468)
Cancelled (20,886)
Outstanding at end of period 761,423 [1]
Vested or expected to vest 761,423
Performance Shares
  
Number of Shares  
Outstanding beginning balance 2,190,778
Granted 1,327,478
Cancelled (188,038)
Outstanding at end of period 3,330,218 [1]
Vested or expected to vest 2,258,631
[1] Outstanding performance shares are reflected at the maximum possible payout that may be earned during the relevant performance periods.