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Changes in Carrying Value of Indefinite-Lived Franchise Rights Acquired (Detail) $ in Thousands	9 Months Ended
	Oct. 03, 2015 USD ($)
Franchise Rights Acquired [Line Items]
Franchise rights acquired, beginning balance	$ 759,838
Effect of exchange rate changes	(9,939)
Franchise rights acquired, ending balance	$ 749,899

X

- Definition

Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through a franchise arrangement having an indefinite period of benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 350



-SubTopic 30



-Section 50



-Paragraph 2



-Subparagraph (b)



-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

Name:	us-gaap_IndefiniteLivedFranchiseRights
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Franchise Rights Acquired [Line Items]

+ References

No definition available.

+ Details

Name:	wtw_FranchiseRightsAcquiredLineItems
Namespace Prefix:	wtw_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of increase (decrease) of assets, excluding financial assets and goodwill, lacking physical substance, from foreign currency translation adjustments.

+ References

No definition available.

+ Details

Name:	wtw_FranchiseRightsAcquiredTranslationAdjustments
Namespace Prefix:	wtw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration