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Long-Term Compensation - LTIP Units Awards (Detail) - Long Term Incentive Plan Units [Member]
shares in Thousands
9 Months Ended
Sep. 30, 2018
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Shares, Beginning Balance 1,532
Vested LTIP Units 887
Vested LTIP Units – POP 1,170
Conversion to common limited partnership units (204)
Number of Shares, Ending Balance 3,385
Number of Unvested Awards, Beginning Balance 1,829
Granted 1,337
Forfeited (82)
Vested LTIP Units (887)
Number of Unvested Awards, Ending Balance 2,197
Weighted Average Grant Date Fair Value | $ / shares $ 46.48
Unvested Weighted Average Grant Date Fair Value, Granted | $ / shares 61.31
Weighted Average Grant Date Fair Value, Forfeited | $ / shares 48.23
Unvested Weighted Average Grant Date Fair Value, Vested LTIP Units | $ / shares 45.25
Weighted Average Grant Date Fair Value, Vested LTIP Units - POP | $ / shares 0
Weighted Average Gant Date Fair Value, Conversion to common limited partnership units | $ / shares 0
Weighted Average Grant Date Fair Value | $ / shares $ 55.92