Intangible Assets - Additional Information (Detail)	6 Months Ended
Jun. 30, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Intangible assets estimated remaining useful life	13 years 1 month 6 days

Useful life 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_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration