Investment Company, Capital Share Transactions [Line Items]

No definition available.

Name:	cnl_InvestmentCompanyCapitalShareTransactionsLineItems
Namespace Prefix:	cnl_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Proceeds Including Distributions Reinvested

+ References

No definition available.

+ Details

Name:	cnl_ProceedsIncludingDistributionsReinvested
Namespace Prefix:	cnl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Selling commission and dealer manager fee.

+ References

No definition available.

+ Details

Name:	cnl_SellingCommissionAndDealerManagerFee
Namespace Prefix:	cnl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Shares Issued, Including Reinvestments

+ References

No definition available.

+ Details

Name:	cnl_SharesIssuedIncludingReinvestments
Namespace Prefix:	cnl_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

+ Details

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

- Definition

Amounts due from owners or affiliates of the reporting entity related to issuance of the entity's capital stock before cash payment is received (does not include amounts due from officers or directors). This element would also include the receivable for proceeds from the issuance of shares under employee stock option exercises which proceeds have not been received as of the reporting date due to the timing of the transaction date versus the settlement date.

+ References

+ Details

Name:	us-gaap_ReceivableFromShareholdersOrAffiliatesForIssuanceOfCapitalStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Cash received on stock transaction after deduction of issuance costs.

+ References

No definition available.

+ Details

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

- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of new stock issued during the period.

+ References

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(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 4: 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(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Value of stock issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the holder of the stock to reinvest dividends paid to them by the entity on new issues of stock by the entity.

+ References

+ Details

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

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=cnl_PublicOfferingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=cnl_PublicOfferingAndPrivatePlacementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=cnl_DistributionReinvestmentPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=cnl_CommonClassFaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=cnl_A2019PrivateOfferingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=cnl_CommonClassTMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=cnl_CommonClassDMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=cnl_CommonClassIMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Capital Transactions - Summary of Shares Issued and Proceeds Received in Connection with Private Placement (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Sep. 30, 2018
Investment Company, Capital Share Transactions [Line Items]
Distributions reinvested, proceeds to company	$ 380,187	$ 101,204
Shares Issued, Including Reinvestments	962,354	403,313
Net Proceeds to Company	$ 26,231,946
Average Net Proceeds per Share	$ 27.26			$ 26.47
Receivable from Shareholders or Affiliates for Issuance of Capital Stock	$ 5,389,738		$ 0
Proceeds from Offerings
Investment Company, Capital Share Transactions [Line Items]
Shares Issued		399,472
Public Offering and Private Placement
Investment Company, Capital Share Transactions [Line Items]
Shares Issued	948,194	399,472
Gross Proceeds		$ 10,997,365
Up-front Selling Commissions and Dealer Manager Fees		(424,311)
Net Proceeds to Company		10,573,054
Net Proceeds to Company		$ 10,674,258
Distribution Reinvestment Plan [Member]
Investment Company, Capital Share Transactions [Line Items]
Stock Issued During Period, Shares, Dividend Reinvestment Plan	14,160	3,841
Distributions reinvested, proceeds to company	$ 380,187	$ 101,204
Class FA
Investment Company, Capital Share Transactions [Line Items]
Shares Issued, Including Reinvestments	474,091
Net Proceeds to Company	$ 13,091,025
Average Net Proceeds per Share	$ 27.61
Class FA \| 2019 Private Offering [Member]
Investment Company, Capital Share Transactions [Line Items]
Shares Issued	300,000
Class FA \| Distribution Reinvestment Plan [Member]
Investment Company, Capital Share Transactions [Line Items]
Stock Issued During Period, Shares, Dividend Reinvestment Plan	0
Distributions reinvested, proceeds to company	$ 0
Class A
Investment Company, Capital Share Transactions [Line Items]
Shares Issued, Including Reinvestments	127,375	178,931
Net Proceeds to Company	$ 3,414,258	$ 4,727,303
Average Net Proceeds per Share	$ 26.80			26.42
Class A \| Proceeds from Offerings
Investment Company, Capital Share Transactions [Line Items]
Shares Issued	120,775	177,162
Gross Proceeds	$ 3,461,287	$ 5,072,865
Up-front Selling Commissions and Dealer Manager Fees	(224,005)	(392,249)
Net Proceeds to Company	$ 3,237,282	$ 4,680,616
Class A \| Distribution Reinvestment Plan [Member]
Investment Company, Capital Share Transactions [Line Items]
Stock Issued During Period, Shares, Dividend Reinvestment Plan	6,600	1,769
Distributions reinvested, proceeds to company	$ 176,976	$ 46,687
Class T
Investment Company, Capital Share Transactions [Line Items]
Shares Issued, Including Reinvestments	135,653	24,287
Net Proceeds to Company	$ 3,648,838	$ 644,426
Average Net Proceeds per Share	$ 26.90			26.53
Class T \| Proceeds from Offerings
Investment Company, Capital Share Transactions [Line Items]
Shares Issued	134,641	24,231
Gross Proceeds	$ 3,802,228	$ 675,000
Up-front Selling Commissions and Dealer Manager Fees	(180,606)	(32,062)
Net Proceeds to Company	$ 3,621,622	$ 642,938
Class T \| Distribution Reinvestment Plan [Member]
Investment Company, Capital Share Transactions [Line Items]
Stock Issued During Period, Shares, Dividend Reinvestment Plan	1,012	56
Distributions reinvested, proceeds to company	$ 27,216	$ 1,488
Class D
Investment Company, Capital Share Transactions [Line Items]
Shares Issued, Including Reinvestments	29,906	14,975
Net Proceeds to Company	$ 791,846	$ 392,096
Average Net Proceeds per Share	$ 26.48			26.18
Class D \| Proceeds from Offerings
Investment Company, Capital Share Transactions [Line Items]
Shares Issued	27,873	13,749
Gross Proceeds	$ 738,000	$ 360,000
Up-front Selling Commissions and Dealer Manager Fees	0	0
Net Proceeds to Company	$ 738,000	$ 360,000
Class D \| Distribution Reinvestment Plan [Member]
Investment Company, Capital Share Transactions [Line Items]
Stock Issued During Period, Shares, Dividend Reinvestment Plan	2,033	1,226
Distributions reinvested, proceeds to company	$ 53,846	$ 32,096
Class I
Investment Company, Capital Share Transactions [Line Items]
Shares Issued, Including Reinvestments	186,299	185,120
Net Proceeds to Company	$ 5,037,104	$ 4,910,433
Average Net Proceeds per Share	$ 27.04			$ 26.53
Class I \| Proceeds from Offerings
Investment Company, Capital Share Transactions [Line Items]
Shares Issued	181,784	184,330
Gross Proceeds	$ 4,914,955	$ 4,889,500
Up-front Selling Commissions and Dealer Manager Fees	0	0
Net Proceeds to Company	$ 4,914,955	$ 4,889,500
Class I \| Distribution Reinvestment Plan [Member]
Investment Company, Capital Share Transactions [Line Items]
Stock Issued During Period, Shares, Dividend Reinvestment Plan	4,515	790
Distributions reinvested, proceeds to company	$ 122,149	$ 20,933