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Stockholder's Equity - Activity Relating to Common Shares (Detail) - shares
 1 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Beginning balance, shares   45,525,000
Beginning balance, shares   (10,415,000)
Beginning balance, shares   35,110,000
Shares repurchased (25,000) (342,107)
Ending balance, shares 45,262,000 45,262,000
Ending balance, shares (10,198,000) (10,198,000)
Ending balance, shares 35,064,000 35,064,000
Stock Compensation Plan [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Beginning balance, shares   35,110,000
Shares repurchased   (367,000)
Shares reissued   584,000
Shares acquired through cashless exercise [1]   (263,000)
Ending balance, shares 35,064,000 35,064,000
Common Stock [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Beginning balance, shares   45,525,000
Shares cancelled   (263,000)
Ending balance, shares 45,262,000 45,262,000
Treasury Stock [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Beginning balance, shares   (10,415,000)
Shares repurchased   (367,000)
Shares reissued   584,000
Shares acquired through cashless exercise [1]   (263,000)
Shares cancelled   263,000
Ending balance, shares (10,198,000) (10,198,000)
[1] All shares acquired represent shares tendered to cover the strike price for options and tax withholdings on the intrinsic value of options exercised or restricted stock vested. These shares have been cancelled by the Company.