Quarterly report pursuant to Section 13 or 15(d)

Restricted Stock Unit Outstanding (Detail)

v2.4.0.8
Restricted Stock Unit Outstanding (Detail) (Restricted Stock Units (RSUs))
 6 Months Ended
Jun. 30, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Awards expected to vest by period 1,915,919
2013 | Restricted Stock Units Subject To Service Requirements
  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Awards expected to vest by period 474,044
2014 | Restricted Stock Units Subject To Service Requirements
  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Awards expected to vest by period 339,033
2014 | Related to TSR Performance Measurements
  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Awards expected to vest by period 139,233 [1]
2015 | Restricted Stock Units Subject To Service Requirements
  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Awards expected to vest by period 23,500
2015 | Related to TSR Performance Measurements
  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Awards expected to vest by period 282,033 [2]
2015 | Related to Company Performance Measurements
  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Awards expected to vest by period 658,076 [3]
[1] In addition to service requirements, these RSUs are also subject to TSR performance requirements not yet measureable, with awards ranging from 0% to 150% of amounts granted.
[2] In addition to service requirements, these RSUs are also subject to TSR performance requirements not yet measureable, with awards ranging from 0% to 200% of amounts granted.
[3] In addition to service requirements, these RSUs are also subject to certain Company-specific performance requirements not yet measureable, with awards ranging from 0% to 150% of amounts granted.