Goodwill and Intangible Assets, Net - Additional Information (Details) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019 USD ($) reporting_unit	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill accumulated impairment losses	$ 14,001		$ 14,001		$ 13,823
Goodwill, impairment loss	178		178
Intangible assets divested from deconsolidation	11,567		11,567
Amortization expense	$ 2,728	$ 4,689	$ 8,498	$ 14,472
Number of reporting units closed \| reporting_unit	2

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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