Commitments and Contingencies - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)	Sep. 30, 2017 Hotel
Other Commitments [Line Items]
Purchase commitment, remaining minimum amount committed	$ 120
Hurricanes Irma and Maria [Member]
Other Commitments [Line Items]
Total loss recognized, representing losses up to the amount of deductibles	$ 16
Key West [Member] | Hurricanes Irma and Maria [Member]
Other Commitments [Line Items]
Number of hotels sustained damage | Hotel		2