Loan Receivable - Activity Related to Loans Receivable (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Receivables [Abstract]
Balance at beginning of year	$ 8,400	$ 8,400
Purchase and advances	0	0
Interest received, net	0	0
Repayments/sale proceeds	(8,097)		$ (5,987)
Change in liquidation value	(303)		100
Balance at end of year	$ 0	$ 8,400	$ 8,400

The net amount paid or received by the reporting entity associated with purchase (sale or collection) of loans receivable arising from the financing of goods and services.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3098-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3095-108585

Name:	us-gaap_PaymentsForProceedsFromLoansReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration