Intangible Asset - Additional Information (Detail)	3 Months Ended
Mar. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Intangible asset estimated weighted- average remaining useful life	11 years 3 months 18 days

Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration