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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 9 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Sep. 30, 2015
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 (100) (200)  
Ending balance, shares 45,595   45,595
Ending balance, shares (9,967)   (9,967)
Ending balance, shares 35,628   35,628
Common Stock [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Beginning balance, shares     44,769
Options exercised     745
Restricted stock grants     615
Shares cancelled     (534)
Ending balance, shares 45,595   45,595
Treasury Stock [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Beginning balance, shares     (9,667)
Shares repurchased     (300)
Shares acquired through cashless exercise [1]     (534)
Shares cancelled     534
Ending balance, shares (9,967)   (9,967)
Stock Compensation Plan [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Beginning balance, shares     35,102
Shares repurchased     (300)
Options exercised     745
Restricted stock grants     615
Shares acquired through cashless exercise [1]     (534)
Ending balance, shares 35,628   35,628
[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.