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Acquisition of Businesses - Summary of Acquisition Date Fair Value of Each Major Class of Consideration Transferred (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2018
USD ($)
Regent [member]  
Disclosure of detailed information about business combination [line items]  
Description of payment of stock option exercised Comprises the present value of the expected amounts payable on exercise of the put and call options, assuming $39m is paid in 2026 to acquire an additional 25% of RHW with the remaining 24% acquired in 2028 for $42m. The amount payable on exercise of the options is based on the annual trailing revenue of RHW, with a floor applied. The range of possible outcomes is $81m to $261m (undiscounted). The final put and call options are exercisable in 2033. The value of the contingent consideration is subject to periodic re-assessment as interest rates and RHW revenue expectations change.
Regent [member] | Minimum [member]  
Disclosure of detailed information about business combination [line items]  
Range of amounts payable on exercise of put and call options $ 81,000,000
Regent [member] | Maximum [member]  
Disclosure of detailed information about business combination [line items]  
Range of amounts payable on exercise of put and call options 261,000,000
Regent [member] | Payment due in 2026 [member]  
Disclosure of detailed information about business combination [line items]  
Cash consideration $ 39,000,000
Cash consideration years 2026
Regent [member] | Payment due in 2026 [member] | Regent Hospitality Worldwide Inc [member]  
Disclosure of detailed information about business combination [line items]  
Percentage to be acquired on exercise 25.00%
Regent [member] | Payment due in 2028 [member] | Regent Hospitality Worldwide Inc [member]  
Disclosure of detailed information about business combination [line items]  
Cash consideration $ 42,000,000
Cash consideration years 2028
Percentage to be acquired on exercise 24.00%
Regent [member] | Payment due in 2021 [member]  
Disclosure of detailed information about business combination [line items]  
Cash consideration $ 13,000,000
Cash consideration year 2021
Regent [member] | Payment due in 2024 [member]  
Disclosure of detailed information about business combination [line items]  
Cash consideration $ 13,000,000
Cash consideration year 2024
UK Portfolio [member]  
Disclosure of detailed information about business combination [line items]  
Lease payment condition Comprises the present value of the above-market element of the expected lease payments over the 25 year lives of the hotel lease agreements. The undiscounted amount is $217m. The value of the contingent consideration has been assessed with the assistance of professional third party advisors and is subject to periodic re-assessment as interest rates and expected lease payments change. The above market assessment has been determined by comparing the expected lease payments as a percentage of forecast hotel operating profit (before depreciation and rent) with market metrics, on a lease by lease basis. There is no floor to the amount payable and no maximum amount.
Expected lease payments undiscounted $ 217,000,000
UK Portfolio [member] | Contingent Consideration [member]  
Disclosure of detailed information about business combination [line items]  
Lease payment condition 25 years
UK Portfolio [member] | Working capital [member]  
Disclosure of detailed information about business combination [line items]  
Lease payment condition Subject to final agreement and receivable in early 2019.