XML 57 R43.htm IDEA: XBRL DOCUMENT v2.4.0.8
Share Based Compensation - Additional Information (Detail) (USD $)
 6 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Performance Unit Incentive Plan (PUP) [Member]
Jun. 30, 2012
Performance Unit Incentive Plan (PUP) [Member]
Dec. 31, 2012
Performance Unit Incentive Plan (PUP) [Member]
Jun. 30, 2013
Restricted Stock [Member]
Jun. 30, 2013
Restricted Stock Units and Performance Based Restricted Stock Units [Member]
Dec. 31, 2012
Restricted Stock Units and Performance Based Restricted Stock Units [Member]
Jan. 31, 2012
PBRS [Member]
Feb. 28, 2013
Restricted Stock Unit [Member]
Feb. 28, 2012
Restricted Stock Unit [Member]
Jun. 30, 2013
Restricted Stock Unit [Member]
Jun. 30, 2013
Stock Options [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                          
Unamortized cost           $ 4,900,000              
Recognition Period of Unrecognized cost           2 years             1 year
Repurchase of Common Stock for Employee Tax Withholding Obligations amount 1,300,000 1,000,000                      
Repurchased shares tax withholding 47,160 50,894                      
Shares Available for Grant 1,004,579                        
Liabilities related to restricted stock             355,000 633,000          
Payments To Employees 0 0             35,000 300,000 257,000    
Liability awards recorded     4,200,000   3,700,000                
PUP award vested     0 0   155,486           11,300  
Total unrecognized cost related to non-vested stock option awards $ 7,000                        
Stock options granted 0