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Stockholders' Equity - Activity Relating to Common Shares (Detail)
 6 Months Ended
Jun. 30, 2017
shares
Equity [Abstract]  
Issued shares, beginning balance 45,324,000
Treasury shares, beginning balance (10,272,000)
Outstanding shares, beginning balance 35,052,000
Shares repurchased (354,293)
Vesting of performance share units 115,000
Stock option exercises 71,000
Shares acquired through cashless exercise (63,000) [1]
Issued shares, shares cancelled (63,000)
Treasury shares, shares cancelled 63,000
Issued shares, ending balance 45,447,000
Treasury shares, ending balance (10,626,000)
Outstanding shares, ending balance 34,821,000
[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.