Pension Plans and Defined Contribution Plan - Schedule of Fair Values of Pension Plan Assets (Parenthetical) (Detail)	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Compensation And Retirement Disclosure [Abstract]
Minimum investment for funding in assets	98.00%	98.00%

Minimum percentage of investments in assets of domestic real estate daily valued mutual fund that are included in the Morgan Stanley REIT index.

No definition available.

Name:	esnd_DefinedBenefitPlanMinimumInvestmentForFundingInAssets
Namespace Prefix:	esnd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration