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Goodwill - Additional Information (Detail) (USD $)
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3 Months Ended | 12 Months Ended | 3 Months Ended | |||
|---|---|---|---|---|---|---|
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Dec. 31, 2014
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Sep. 30, 2014
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2012
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| Goodwill [Line Items] | ||||||
| Change in goodwill | $ 0 | |||||
| Goodwill and intangible assets impairment | 0 | 0 | ||||
| Goodwill impairment charges | 16,739,000 | |||||
| Sales of certain pay-per-click advertising assets | 136,000 | |||||
| Archeo | ||||||
| Goodwill [Line Items] | ||||||
| Goodwill and intangible assets impairment | 15,800,000 | |||||
| Goodwill impairment charges | 16,700,000 | |||||
| Archeo | Discontinued Operations | ||||||
| Goodwill [Line Items] | ||||||
| Goodwill and intangible assets impairment | 902,000 | |||||
| Goodwill impairment charges | $ 902,000 | |||||