Leases - Additional Information (Detail)	3 Months Ended
Mar. 31, 2019
Minimum [Member]
Lessee Lease Description [Line Items]
Lease expiration year	2019
Maximum [Member]
Lessee Lease Description [Line Items]
Lease expiration year	2024

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.

No definition available.

Name:	us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration