Commitments and Contingencies - Additional Information (Detail) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019 USD ($) Hotel	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Apr. 30, 2019 USD ($)	Mar. 04, 2019 USD ($)	Jul. 07, 2017 Hotel	Dec. 31, 2016 USD ($)
Long-term Purchase Commitment [Line Items]
Insurance receivable	$ 9,427	$ 11,958		$ 4,300	$ 16,100		$ 5,100
Allowance on insurance receivable			$ 5,000
Loss on disposals of investment in real estate			$ 5,000
Total remediation costs and estimated loss due to property damage	500	4,800
Insurance deductable amount	$ (1,532)	$ 1,200
Number of subset of hotels with ground leases | Hotel	2
Lessee, operating lease, Description	the Company is the lessee in a parking lease with a remaining term of eight years.
Operating lease , right of use assets	$ 600
Operting lease liabilities	$ 633
Operating lease, weighted average discount rate	4.50%
Operating lease, weighted average remaining lease term	7 years
Operating Lease, Payments	$ 100
Courtyard - Dothan, Alabama Property [Member]
Long-term Purchase Commitment [Line Items]
Sale of hotel	2019-02
Hotel [Member]
Long-term Purchase Commitment [Line Items]
Number of hotels owned | Hotel	45					52
Franchise Agreements [Member] | Minimum [Member]
Long-term Purchase Commitment [Line Items]
Royalty fee	4.50%
Franchise Agreements [Member] | Maximum [Member]
Long-term Purchase Commitment [Line Items]
Royalty fee	6.00%
Affiliated Entity [Member]
Long-term Purchase Commitment [Line Items]
Management agreement terms, description	The agreements with less than one year remaining in their term generally automatically renew on annual or month-to-month terms unless either party to the agreement gives prior notice of the termination thereof.
Affiliated Entity [Member] | Minimum [Member]
Long-term Purchase Commitment [Line Items]
Payment of management fee as percentage of revenues	2.00%
Management agreement remaining terms, period	1 year
Affiliated Entity [Member] | Maximum [Member]
Long-term Purchase Commitment [Line Items]
Payment of management fee as percentage of revenues	7.00%
Management agreement remaining terms, period	15 years
Affiliated Entity [Member] | Management Agreements [Member] | Hotel [Member]
Long-term Purchase Commitment [Line Items]
Number of hotels owned | Hotel	45