Intangibles - Gross Carrying Amount and Accumulated Amortization of Intangible Assets and Liabilities (Detail) $ in Thousands	Jun. 30, 2017 USD ($)
Intangible assets:
Total intangible assets	$ 93,242
Accumulated amortization:
Total accumulated amortization	(15,646)
Intangible assets, net	77,596
Intangible liabilities:
Below-market lease intangibles	11,548
Accumulated amortization	(502)
Intangible liabilities, net	11,046
In-place Lease Intangibles [Member]
Intangible assets:
Total intangible assets	69,461
Accumulated amortization:
Total accumulated amortization	(15,432)
Intangible assets, net	54,029
Below-market Ground Lease Intangibles [Member]
Intangible assets:
Total intangible assets	4,683
Accumulated amortization:
Total accumulated amortization	(40)
Intangible assets, net	4,643
Above-market Lease Intangibles [Member]
Intangible assets:
Total intangible assets	2,984
Accumulated amortization:
Total accumulated amortization	(137)
Intangible assets, net	2,847
Prepaid Ground Lease Rent [Member]
Intangible assets:
Total intangible assets	16,114
Accumulated amortization:
Total accumulated amortization	$ (37)