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Long-Term Compensation - LTIP Units Awards (Detail) - Long Term Incentive Plan Units [Member]
shares in Thousands
6 Months Ended
Jun. 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 (52)
Number of Shares, Ending Balance 3,537
Number of Unvested Awards, Beginning Balance 1,829
Granted 1,246
Forfeited (70)
Vested LTIP Units (887)
Number of Unvested Awards, Ending Balance 2,118
Weighted Average Grant Date Fair Value | $ / shares $ 46.48
Unvested Weighted Average Grant Date Fair Value, Granted | $ / shares 60.95
Weighted Average Grant Date Fair Value, Forfeited | $ / shares 47.66
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 $ 55.46