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Stockholder's Equity - Activity Relating to Common Shares and Contingently Redeemable Common Shares (Detail) - shares
shares in Thousands
 1 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Beginning balance, shares   43,769    
Beginning balance, shares   (9,667)    
Beginning balance, shares   34,102    
Shares repurchased (200)      
Options exercised   751    
Shares acquired through cashless exercise   (611) (1,787) (1,966)
Ending balance, shares   45,525 43,769  
Ending balance, shares   (10,415) (9,667)  
Ending balance, shares   35,110 34,102  
Common Stock [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Beginning balance, shares   44,769 43,641 41,889
Conversion of preferred stock     65 389
Options exercised   751 1,900 2,330
Restricted stock grant   615 950 1,000
Shares cancelled   (610) (1,787) (1,967)
Ending balance, shares   45,525 44,769 43,641
Treasury Stock [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Beginning balance, shares   (9,667) (8,275) (1,018)
Shares repurchased   (748) (2,392) (7,257)
Treasury shares reissued and classified as contingently redeemable common stock [1]     1,000  
Shares acquired through cashless exercise [2]   (610) (1,787) (1,967)
Shares cancelled   610 1,787 1,967
Ending balance, shares   (10,415) (9,667) (8,275)
Stock Compensation Plan [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Beginning balance, shares   35,102 35,366 40,871
Conversion of preferred stock     65 389
Shares repurchased   (748) (2,392) (7,257)
Treasury shares reissued and classified as contingently redeemable common stock [1]     1,000  
Options exercised   751 1,900 2,330
Restricted stock grant   615 950 1,000
Shares acquired through cashless exercise [2]   (610) (1,787) (1,967)
Ending balance, shares   35,110 35,102 35,366
[1] Subsequent to December 31, 2014, 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.