Commitments and contingencies.

No definition available.

Name:	esnd_CommitmentsAndContingenciesLineItems
Namespace Prefix:	esnd_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs.

+ References

+ Details

Name:	us-gaap_LitigationReserve
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.

+ References

No definition available.

+ Details

Name:	us-gaap_LitigationSettlementExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

+ Details

Name:	us-gaap_LossContingencyDamagesSoughtValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of plaintiffs that have filed claims pertaining to a loss contingency.

+ References

No definition available.

+ Details

Name:	us-gaap_LossContingencyNumberOfPlaintiffs
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=esnd_MediationActivitiesAndSettlementNegotiationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LitigationCaseAxis=esnd_InadvertentViolationUnderTCPAForUnsolicitedFaxAdvertisementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LitigationCaseAxis=esnd_WillfulViolationUnderTCPAForUnsolicitedFaxAdvertisementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=esnd_UnitedStatesDistrictCourtCaliforniaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=esnd_UnitedStatesDistrictCourtIllinoisMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Legal Matters - Additional Information (Detail)			3 Months Ended	6 Months Ended	12 Months Ended
Legal Matters - Additional Information (Detail)	Jan. 14, 2016 Lawsuit	May 01, 2015 Lawsuit	Jun. 30, 2017 USD ($)	Jun. 30, 2017 USD ($) Lawsuit	Dec. 31, 2016 USD ($)
Commitments And Contingencies [Line Items]
Number of lawsuits filed \| Lawsuit				2
Total reserve			$ 10,000,000	$ 10,000,000
Mediation Activities and Settlement Negotiations [Member]
Commitments And Contingencies [Line Items]
Pre-tax reserve recorded				6,000,000
Warehousing, Marketing and Administrative Expenses [Member]
Commitments And Contingencies [Line Items]
Pre-tax reserve recorded			$ 3,000,000	3,000,000	$ 4,000,000
Inadvertent Violation under TCPA for Unsolicited Fax Advertisement [Member]
Commitments And Contingencies [Line Items]
Damages sought by plaintiff per violation				500
Willful Violation under TCPA for Unsolicited Fax Advertisement [Member]
Commitments And Contingencies [Line Items]
Damages sought by plaintiff per violation				$ 1,500
United States District Court California [Member]
Commitments And Contingencies [Line Items]
Number of lawsuits filed \| Lawsuit		1
United States District Court Illinois [Member]
Commitments And Contingencies [Line Items]
Number of lawsuits filed \| Lawsuit	1