Long-Term Debt - Summary of Long-Term Debt (Parenthetical) (Detail)	6 Months Ended
Jun. 30, 2020	Feb. 29, 2020
4.25% Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument stated interest rate	4.25%
Debt instrument, maturity date	Mar. 01, 2037
3.95% Promissory Note [Member]
Debt Instrument [Line Items]
Debt instrument stated interest rate	3.95%	3.95%
Debt instrument, maturity date	Feb. 17, 2020
4% Promissory Note [Member]
Debt Instrument [Line Items]
Debt instrument stated interest rate	4.00%
Debt instrument, maturity date	Feb. 01, 2031
3.75% Callable Promissory Note [Member]
Debt Instrument [Line Items]
Debt instrument stated interest rate	3.75%
Debt instrument, maturity date	Sep. 01, 2036
4.55% Promissory note [Member]
Debt Instrument [Line Items]
Debt instrument stated interest rate	4.55%
Debt instrument, maturity date	Aug. 01, 2036
3.90% Promissory Note [Member]
Debt Instrument [Line Items]
Debt instrument stated interest rate	3.90%
Debt instrument, maturity date	Apr. 01, 2032
Finance Lease Liabilities [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Aug. 15, 2023

Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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.

+ References

No definition available.

+ Details

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

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_LongtermDebtTypeAxis=hci_FourPointTwoFivePercentageConvertibleSeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=hci_ThreePointNineFivePercentagePromissoryNoteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=hci_FourPercentagePromissoryNoteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=hci_ThreePointSevenFivePercentageCallablePromissoryNoteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=hci_FourPointFiveFivePercentageConvertibleSeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=hci_ThreePointNineZeroPercentagePromissoryNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=hci_FinanceLeaseLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: