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Stockholder's Equity - Activity Relating to Common Shares and Contingently Redeemable Common Shares (Detail)
shares in Thousands
 6 Months Ended
Jun. 30, 2015
shares
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)
Ending balance, shares 45,562
Ending balance, shares (9,867)
Ending balance, shares 35,695
Common Stock [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Beginning balance, shares 44,769
Options exercised 678
Restricted stock grants 615
Shares cancelled (500)
Ending balance, shares 45,562
Treasury Stock [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Beginning balance, shares (9,667)
Shares repurchased (200)
Shares acquired through cashless exercise [1] (500)
Shares cancelled 500
Ending balance, shares (9,867)
Stock Compensation Plan [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Beginning balance, shares 35,102
Shares repurchased (200)
Options exercised 678
Restricted stock grants 615
Shares acquired through cashless exercise [1] (500)
Ending balance, shares 35,695
[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.