Subsequent Event - Additional Information (Detail) - Subsequent Event	Feb. 15, 2018 USD ($)
TH2
Subsequent Event [Line Items]
Cash contributed in joint venture	$ 47,000
TH2 \| Tourism Holdings Limited ('thl')
Subsequent Event [Line Items]
Assets contributed to joint venture	$ 47,000
TH2
Subsequent Event [Line Items]
Ownership percent	50.00%
TH2 \| Tourism Holdings Limited ('thl')
Subsequent Event [Line Items]
Ownership percent	50.00%

The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

Name:	us-gaap_PaymentsToAcquireInterestInJointVenture
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration