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Stockholders' Equity - Activity Relating to Common Shares (Detail) - shares
 1 Months Ended 8 Months Ended 9 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Sep. 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 (95,000) (342,107)  
Ending balance, shares 45,292,000   45,292,000
Ending balance, shares (10,268,000)   (10,268,000)
Ending balance, shares 35,024,000   35,024,000
Stock Compensation Plan [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Beginning balance, shares     35,110,000
Shares repurchased     (437,000)
Shares reissued     584,000
Options exercised     56,000
Shares acquired through cashless exercise [1]     (289,000)
Shares cancelled     0
Ending balance, shares 35,024,000   35,024,000
Common Stock [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Beginning balance, shares     45,525,000
Shares repurchased     0
Shares reissued     0
Options exercised     56,000
Shares acquired through cashless exercise [1]     0
Shares cancelled     (289,000)
Ending balance, shares 45,292,000   45,292,000
Treasury Stock [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Beginning balance, shares     (10,415,000)
Shares repurchased     (437,000)
Shares reissued     584,000
Options exercised     0
Shares acquired through cashless exercise [1]     (289,000)
Shares cancelled     289,000
Ending balance, shares (10,268,000)   (10,268,000)
[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.