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Stockholders' Equity - Activity Relating to Common Shares (Detail)
 3 Months Ended
Mar. 31, 2017
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Beginning balance, shares 45,324,000
Beginning balance, shares (10,272,000)
Beginning balance, shares 35,052,000
Shares repurchased (100,079)
Ending balance, shares 45,445,000
Ending balance, shares (10,372,000)
Ending balance, shares 35,073,000
Stock Compensation Plan [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Beginning balance, shares 35,052,000
Shares repurchased (100,000)
Vesting of performance share units 115,000
Stock option exercises 65,000
Shares acquired through cashless exercise (59,000) [1]
Shares cancelled 0
Ending balance, shares 35,073,000
Common Stock [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Beginning balance, shares 45,324,000
Shares repurchased 0
Vesting of performance share units 115,000
Stock option exercises 65,000
Shares acquired through cashless exercise 0 [1]
Shares cancelled (59,000)
Ending balance, shares 45,445,000
Treasury Stock [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Beginning balance, shares (10,272,000)
Shares repurchased (100,000)
Vesting of performance share units 0
Stock option exercises 0
Shares acquired through cashless exercise (59,000) [1]
Shares cancelled 59,000
Ending balance, shares (10,372,000)
[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 performance share units vested. These shares have been cancelled by the Company.