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Capital Stock - Conditional Restricted Stock (Detail)
shares in Thousands
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Non-vested at January 1, 2014, Weighted Average Grant Date Fair Value $ 81.96
Granted, Weighted Average Grant-Date Fair Value 61.65
Vested, Weighted Average Grant-Date Fair Value 81.14
Non-vested at December 31, 2014, Weighted Average Grant Date Fair Value $ 70.12
Total Shareholder Return Stock Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted Shares, nonvested, Beginning Balance, Shares | shares 354
Granted, Shares | shares 0
Vested, Shares | shares 0
Forfeited or expired, Shares | shares (182)
Restricted Shares, nonvested, Ending Balance, Shares | shares 172
Non-vested at January 1, 2014, Weighted Average Grant Date Fair Value $ 78.13
Granted, Weighted Average Grant-Date Fair Value 0
Vested, Weighted Average Grant-Date Fair Value 0
Forfeited or expired, Weighted Average Grant-Date Fair Value 72.09
Non-vested at December 31, 2014, Weighted Average Grant Date Fair Value $ 78.22