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Acquisitions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 3 Months Ended | 12 Months Ended
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Jun. 27, 2016 | Mar. 11, 2015 | Apr. 16, 2014 | Mar. 12, 2014 | Dec. 31, 2016 | Oct. 01, 2016 | Jul. 02, 2016 | Apr. 02, 2016 | Jan. 02, 2016 | Oct. 03, 2015 | Jul. 04, 2015 | Apr. 04, 2015 | Mar. 29, 2014 | Dec. 31, 2016 | Jan. 02, 2016 | Jan. 03, 2015
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, goodwill |  |  |  |  | $ 166,138 |  |  |  | $ 159,331 |  |  |  |  | $ 166,138 | $ 159,331 |
Gain related to acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 10,540
Earnings per share, diluted |  |  |  |  | $ 0.20 | $ 0.53 | $ 0.46 | $ (0.17) | $ (0.18) | $ 0.38 | $ 0.49 | $ (0.10) |  | $ 1.03 | $ 0.56 | $ 2.08
Weight Watchers of Greater Miami, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, net purchase price | $ 3,250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, net purchase price | 2,898 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, cash acquired | 300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, assumed net liabilities | 52 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, goodwill | 2,945 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weight Watchers of Greater Miami, Inc. | Customer Relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, finite lived intangible assets | 191 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weight Watchers of Greater Miami, Inc. | Franchise Rights |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, indefinite lived intangible assets | $ 114 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vigilantes do Peso Marketing Ltda |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, net purchase price |  |  |  | $ 14,181 |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, cash acquired |  |  |  | $ 2,262 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership |  |  |  | 35.00% |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership acquired |  |  |  | 45.00% |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, equity interest held immediately before acquisition |  |  |  | $ 12 |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, fair value of equity interest |  |  |  | 11,029 |  |  |  |  |  |  |  |  |  |  |  |
Remeasurement gain on business acquisition |  |  |  | 11,017 |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition cost associated with settlement of royalty-free arrangement |  |  |  | 477 |  |  |  |  |  |  |  |  |  |  |  |
Gain related to acquisition |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,540 |  |  |
Gain related to acquisition, after-tax |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,429 |  |  |
Earnings per share, diluted |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.11 |  |  |
Business acquisition, fair value of noncontrolling interest |  |  |  | $ 6,157 |  |  |  |  |  |  |  |  |  |  |  |
Vigilantes do Peso Marketing Ltda | Call and Put Option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |
Knowplicity, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, net purchase price |  |  | $ 8,977 |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, net purchase price |  |  | 4,770 |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, cash acquired |  |  | 11 |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, goodwill |  |  | 6,204 |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, common stock issued |  |  | 4,207 |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, website development |  |  | 4,516 |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, prepaid expenses |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, fixed assets |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, deferred tax liabilities |  |  | $ 1,759 |  |  |  |  |  |  |  |  |  |  |  |  |
Weilos |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, net purchase price |  | $ 6,674 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, net purchase price |  | 2,775 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, assumed net liabilities |  | 975 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, goodwill |  | 5,588 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, finite lived intangible assets |  | 1,741 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, common stock issued |  | 2,810 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, fixed assets |  | 24 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, deferred tax liabilities |  | 679 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, restricted stock issued |  | 114 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted shares issued to key employees |  | $ 908 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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- Definition This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Fair value at acquisition-date of the assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interests issued by the acquirer, including but not limited to, instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary difference assumed at the acquisition date that are classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=73531372&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=73531372&loc=d3e2207-128464 + Details
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- Definition Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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- Definition In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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- Definition In a business combination achieved in stages, this element represents the amount of net gain (loss) recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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- Definition The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: 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=66902209&loc=d3e3213-108585 + Details
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