Accounts Receivable, Net - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Receivables [Abstract]
Due from unconsolidated affiliates	$ 2,478	$ 2,819

Amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership, due within 1 year (or 1 business cycle).

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
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-Publisher FASB
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-Section S99
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-Subparagraph (SX 210.4-08.(k)(1))
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
-Topic 850
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-Name Accounting Standards Codification
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Name:	us-gaap_DueFromAffiliateCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant