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Discontinued Operations - Schedule of Gain (Loss) on Disposal Activity (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Loss On Disposal Of Discontinued Operations [Line Items]    
Gain/(loss) on disposal of discontinued operations $ 376 $ (41,095)
Advertising Business [Member]    
Loss On Disposal Of Discontinued Operations [Line Items]    
Write-off of goodwill   (35,472)
Write-off of intangible assets   (4,080)
Write-off of long-term deferred assets   (517)
Lease agreements early termination compensation expenses   (1,211)
Employee severance compensation expenses   (191)
Gain on write-off of acquisition consideration payable 463 463
Loss on disposal of equity interests (87) (87)
Gain/(loss) on disposal of discontinued operations $ 376 $ (41,095)