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Changes in Carrying Value of Indefinite-Lived Franchise Rights Acquired (Detail) $ in Thousands | 9 Months Ended
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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

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- 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

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- 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

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- 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