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Stockholder's Equity - Activity Relating to Common Shares and Contingently Redeemable Common Shares (Detail) - shares
 7 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
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 (98,929)      
Options exercised   124,000    
Ending balance, shares 45,324,000 45,324,000 45,525,000  
Ending balance, shares (10,272,000) (10,272,000) (10,415,000)  
Ending balance, shares 35,052,000 35,052,000 35,110,000  
Stock Compensation Plan [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Beginning balance, shares   35,110,000 35,102,000 35,366,000
Conversion of preferred stock       65,000
Shares repurchased   (441,000) (748,000) (2,392,000)
Treasury shares reissued and classified as contingently redeemable common stock [1]       1,000,000
Options exercised   124,000 751,000 1,900,000
Restricted stock grant     615,000 950,000
Shares acquired through cashless exercise [2]   (325,000) (610,000) (1,787,000)
Shares reissued   584,000    
Ending balance, shares 35,052,000 35,052,000 35,110,000 35,102,000
Common Stock [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Beginning balance, shares   45,525,000 44,769,000 43,641,000
Conversion of preferred stock       65,000
Options exercised   124,000 751,000 1,900,000
Restricted stock grant     615,000 950,000
Shares cancelled   (325,000) (610,000) (1,787,000)
Ending balance, shares 45,324,000 45,324,000 45,525,000 44,769,000
Treasury Stock [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Beginning balance, shares   (10,415,000) (9,667,000) (8,275,000)
Shares repurchased   (441,000) (748,000) (2,392,000)
Treasury shares reissued and classified as contingently redeemable common stock [1]       1,000,000
Shares acquired through cashless exercise [2]   (325,000) (610,000) (1,787,000)
Shares cancelled   325,000 610,000 1,787,000
Shares reissued   584,000    
Ending balance, shares (10,272,000) (10,272,000) (10,415,000) (9,667,000)
[1] Privately negotiated transaction at $19.00 per share, subject to holding period restrictions as of December 31, 2014. Subsequent to December 31, 2014, such restrictions were removed and contingently redeemable common stock was reclassified to common stock.
[2] 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 (as defined in “—Note 9 (Share-Based Compensation)”) vested. These shares have been cancelled by the Company.