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CAPITAL STOCK - Summary of Long-Term Performance Awards Activity (Detail) - Long-Term Performance Awards
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share Units  
Non-vested, Beginning Balance (in shares) | shares 842,541
Granted (in shares) | shares 261,081
Vested (in shares) | shares (162,136)
Forfeited (in shares) | shares (140,412)
Non-vested, Ending Balance (in shares) | shares 801,074
Weighted Average Grant Date Fair Value  
Non-vested, Beginning Balance (USD per share) | $ / shares $ 78.83
Granted (USD per share) | $ / shares 86.56
Vested (USD per share) | $ / shares 71.42
Forfeited (USD per share) | $ / shares 72.11
Non-vested, Ending Balance (USD per share) | $ / shares $ 84.03