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Long-Term Compensation - LTIP Units Awards (Detail) - Long Term Incentive Plan Units [Member]
shares in Thousands
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Shares, Beginning Balance 743
Vested LTIP Units 688
Vested POP LTIP Units 698
Conversion to common limited partnership units (597)
Number of Shares, Ending Balance 1,532
Number of Unvested Awards, Beginning Balance 1,476
Granted 1,041
Vested LTIP Units (688)
Number of Unvested Awards, Ending Balance 1,829
Weighted Average Grant Date Fair Value | $ / shares $ 40.72
Unvested Weighted Average Grant Date Fair Value, Granted | $ / shares 51.11
Unvested Weighted Average Grant Date Fair Value, Vested LTIP Units | $ / shares 41.13
Weighted Average Grant Date Fair Value | $ / shares $ 46.48