Intangibles - Gross Carrying Amount and Accumulated Amortization of Intangible Assets and Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Intangible assets:
Total intangible assets	$ 933,921	$ 403,092
Accumulated amortization:
Total accumulated amortization	(243,034)	(110,434)
Intangible assets, net	690,887	292,658
Intangible liabilities:
Below-market lease intangibles	152,157	62,199
Above-market ground lease intangibles		4,657
Total intangible liabilities	152,157	66,856
Accumulated amortization:
Below-market lease amortization	(21,789)	(11,132)
Above-market ground lease amortization		(15)
Total accumulated amortization	(21,789)	(11,147)
Intangible liabilities, net	130,368	55,709
In-place Lease Intangibles [Member]
Intangible assets:
Total intangible assets	871,031	354,261
Accumulated amortization:
Total accumulated amortization	(233,374)	(104,745)
Intangible assets, net	637,657
Above-market Lease Intangibles [Member]
Intangible assets:
Total intangible assets	41,572	21,626
Accumulated amortization:
Total accumulated amortization	(8,767)	(4,903)
Intangible assets, net	32,805
Prepaid Ground Lease Intangibles [Member]
Intangible assets:
Total intangible assets		16,114
Accumulated amortization:
Total accumulated amortization		(378)
Below-market Ground Lease Intangibles [Member]
Intangible assets:
Total intangible assets		5,415
Accumulated amortization:
Total accumulated amortization		(162)
Other Intangible Assets [Member]
Intangible assets:
Total intangible assets	21,318	5,676
Accumulated amortization:
Total accumulated amortization	$ (893)	$ (246)