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Goodwill and Other Intangibles - Narrative (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2016 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |
Impairment of nonamortizable intangible assets |  | $ 0 | $ 9,200,000 |  |
Impairment of amortizable intangible assets |  |  |  | $ 0 |
Impairment of goodwill |  | 0 | $ 0 |  |
Accumulated amortization of identifiable intangibles |  | $ 168,800,000 |  | 168,800,000 | $ 153,700,000
Sproutling Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Consideration transferred | $ 9,900,000 |  |  |  |
Contingent consideration arrangements, period of arrangement | 3 years |  |  |  |
Fuhu Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Consideration transferred | $ 23,300,000 |  |  |  |
Fuhu Inc. and Sproutling Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Integration related costs |  |  |  | $ 0 | 2,000,000
Sproutling Inc and Fuhu Assets [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Amortizable identifiable intangible assets acquired |  |  |  |  | $ 11,000,000

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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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