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Share-Based Compensation (Detail) (USD $)
1 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended
Dec. 10, 2010
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Jun. 01, 2010
Sep. 30, 2012
Common Stock [Member]
Sep. 30, 2011
Common Stock [Member]
Sep. 30, 2012
Restricted Stock Units [Member]
Sep. 30, 2011
Restricted Stock Units [Member]
Sep. 30, 2011
Founders Grant Award [Member]
Sep. 30, 2011
Founders Grant Award [Member]
Nov. 14, 2007
Founders Grant Award [Member]
Dec. 16, 2008
2008 Bonus Award [Member]
Dec. 16, 2009
2009 Bonus Award [Member]
Jun. 01, 2010
Performance Award [Member]
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Sep. 30, 2012
Performance Award [Member]
Sep. 30, 2011
Performance Award [Member]
Sep. 30, 2012
Performance Award [Member]
Sep. 30, 2011
Performance Award [Member]
Dec. 14, 2010
2010 Bonus Award [Member]
Feb. 02, 2012
2011 Bonus Award [Member]
Jun. 01, 2010
Unvested Restricted Stock Awards [Member]
Jun. 01, 2010
Unvested Stock Options [Member]
Nov. 14, 2009
Second Anniversary [Member]
Founders Grant Award [Member]
Nov. 14, 2011
Third Anniversary [Member]
Founders Grant Award [Member]
Nov. 14, 2010
Third Anniversary [Member]
Founders Grant Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                      
Vesting period of awards                         Four Three Three           Three            
Award vesting rights, percentage vested 25.00%                                               50.00% 25.00% 25.00%
Aggregate fair value                           $ 9,500,000 $ 13,200,000 $ 15,900,000         $ 18,900,000 $ 21,200,000          
Fraction of bonus award vested per year                           One-third                          
Amount of the award granted to retirement - eligible employees                           4,200,000 5,100,000           6,200,000 6,700,000          
Date of tranche of awards vested                           January 9, 2012 December 17, 2012                        
Number of common shares reserved           4,200,000                                 100,000        
Expected amount from the reserved stock                                             1,300,000 16,700,000      
Length of performance award time-vest                               31                      
Award annual fraction of time-vesting                               One-half                      
CEO Award vesting period 5 years                                                    
Stock option award value 3,600,000                                                    
Shares awarded to non-employee directors             4,544 7,840 18,603 21,259                                  
Share-based compensation expense   $ 7,500,000 $ 7,900,000 $ 19,409,000 $ 24,322,000           $ 900,000 $ 2,500,000         $ 600,000 $ 400,000 $ 1,400,000 $ 4,200,000