Name:	esnt_MortgageGuarantyInsuranceContractsMonthlyPoliciesEarnedPremiumPercentageOfTotal
Namespace Prefix:	esnt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents, for single premium primary mortgage insurance policies with a nonrefundable premium, the total amount of unearned premium recognized as earned premium upon notification of cancellation due to repayment of the insured loan by the borrower.

No definition available.

Name:	esnt_NonRefundableSinglePremiumPrimaryMortgageInsuranceUnearnedPremiumRecognizedAsEarnedUponCancellationDueToLoanRepayment
Namespace Prefix:	esnt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the threshold period of coverage for primary mortgage insurance policies to be referred to as single premium policies.

No definition available.

Name:	esnt_PrimaryMortgageGuarantyInsuranceContractsSinglePremiumPoliciesThresholdPeriodOfCoverage
Namespace Prefix:	esnt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_ConcentrationRiskLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592