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Lease Arrangements - Schedule of Future Minimum Lease Payments to be Received from Sales-Type Leases (Parenthetical) (Detail) - USD ($) $ in Thousands	Feb. 27, 2019	Dec. 31, 2018	Dec. 31, 2017
Lessor Lease Description [Line Items]
Future minimum lease payments receivable		$ 13,009	$ 14,238
Customer 1 [Member]
Lessor Lease Description [Line Items]
Future minimum lease payments receivable		$ 7,800
Customer 1 [Member] | Subsequent Events [Member]
Lessor Lease Description [Line Items]
Future minimum lease payments receivable	$ 9,400

X

- Definition

Amount of minimum lease payments to be received by the lessor for capital leases.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84165051&loc=d3e45377-112738

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: