Basis of Presentation - Additional Information (Detail)	1 Months Ended
Mar. 31, 2016 USD ($)
Regulatory Assets [Abstract]
Effect of reclassifications on previous reported operating results	$ 0

The amount of a reclassification adjustment made to prior period financial statement amounts.

No definition available.

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