Quarterly report pursuant to Section 13 or 15(d)

Summary of Option Activity (Detail)

v2.4.0.6
Summary of Option Activity (Detail) (USD $)
3 Months Ended
Mar. 31, 2013
Time Based Units
 
Number of Share Option Awards  
Granted 1,671,113
Forfeited   
Exercised   
Outstanding as of March 31, 2013 1,671,113
Vested as of March 31, 2013 734,226
Non-vested as of March 31, 2013 936,887
Weighted-Average Exercise Price  
Granted $ 19.00
Forfeited   
Exercised   
Outstanding as of March 31, 2013 $ 19.00
Vested as of March 31, 2013 $ 19.00
Non-vested as of March 31, 2013 $ 19.00
Performance-Based Units
 
Number of Share Option Awards  
Granted 1,579,939
Forfeited   
Exercised   
Outstanding as of March 31, 2013 1,579,939
Non-vested as of March 31, 2013 1,579,939
Weighted-Average Exercise Price  
Granted $ 19.00
Forfeited   
Exercised   
Outstanding as of March 31, 2013 $ 19.00
Non-vested as of March 31, 2013 $ 19.00