Goodwill and Intangible Assets, Net - Additional Information (Detail) - USD ($)		3 Months Ended	12 Months Ended
	Oct. 01, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
Goodwill impairments	$ 0
Impairment of intangible assets		$ 33,000,000	$ 34,890,000	$ 7,207,000	$ 2,842,000
Core OTAs
Goodwill [Line Items]
Accumulated goodwill impairment losses		$ 2,500,000,000	$ 2,500,000,000	$ 2,500,000,000