XML 55 R59.htm IDEA: XBRL DOCUMENT
v3.20.1

FINANCING ARRANGEMENTS AND LONG-TERM DEBT (Details) |  |  |  | 1 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 01, 2021 | Mar. 31, 2020 USD ($) installment | Dec. 01, 2016 USD ($) | Mar. 31, 2018 USD ($) installment | Mar. 31, 2017 USD ($) installment | Sep. 30, 2020 | Dec. 31, 2019 USD ($) | Dec. 04, 2019 USD ($) | Sep. 30, 2019 | Dec. 31, 2018 USD ($) | Feb. 10, 2017
FINANCING ARRANGEMENTS AND LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  |  | $ 1,040,000 |  |  | $ 1,651,000 |
Federal Funds Rate |  |  |  |  |  |  |  |  |  |  |
FINANCING ARRANGEMENTS AND LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |
Applicable margin (as a percent) |  |  | 0.50% |  |  |  |  |  |  |  |
Eurodollar Rate |  |  |  |  |  |  |  |  |  |  |
FINANCING ARRANGEMENTS AND LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |
Interest rate basis |  |  | Eurodollar Rate |  |  |  |  |  |  |  |
Applicable margin (as a percent) |  |  | 1.00% |  |  |  |  |  |  |  |
LIBOR |  |  |  |  |  |  |  |  |  |  |
FINANCING ARRANGEMENTS AND LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |
Cap interest rate |  |  |  |  |  |  |  |  |  |  | 4.00%
2016 Credit Agreement |  |  |  |  |  |  |  |  |  |  |
FINANCING ARRANGEMENTS AND LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |
Percentage of proceeds from asset sales used for mandatory repayments of the debt |  |  | 100.00% |  |  |  |  |  |  |  |
Percentage of net proceeds from issuances of debt and equity used for mandatory repayments of the debt |  |  | 100.00% |  |  |  |  |  |  |  |
Percentage of net proceeds from insurance recovery and condemnation events used for mandatory repayments of the debt |  |  | 100.00% |  |  |  |  |  |  |  |
Maximum permitted leverage ratio | 3.00 |  |  |  |  | 3.25 |  |  | 3.75 |  |
Equity repurchase amount |  |  |  |  |  |  |  | $ 8,000,000 |  |  |
Consolidated leverage ratio | 3.00 |  |  |  |  |  |  |  |  |  |
Consolidated fixed charge coverage ratio | 1.25% |  |  |  |  |  |  |  |  |  |
2016 Credit Agreement | Maximum |  |  |  |  |  |  |  |  |  |  |
FINANCING ARRANGEMENTS AND LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |
Consolidated leverage ratio |  |  |  |  |  | 3.25 |  |  |  |  |
2016 Credit Agreement | Term loan facility |  |  |  |  |  |  |  |  |  |  |
FINANCING ARRANGEMENTS AND LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 110,000,000 |  |  |  |  |  |  |  |
Number of quarterly installments | installment |  | 7 |  | 8 | 4 |  |  |  |  |  |
Periodic repayment |  | $ 2,750,000 |  | $ 2,062,500 | $ 1,375,000 |  |  |  |  |  |
Total principal outstanding |  |  |  |  |  |  | $ 86,900,000 |  |  |  |
Effective interest rate |  |  |  |  |  |  | 5.20% |  |  |  |
2016 Credit Agreement | Revolving facility |  |  |  |  |  |  |  |  |  |  |
FINANCING ARRANGEMENTS AND LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 30,000,000 |  |  |  |  |  |  |  |

X
- Definition Consolidated fixed charge coverage ratio is a financial ratio that measures a firm's ability to pay all of its fixed charges or expenses with its income before interest and income taxes. + References No definition available. + Details
Name: | iii_ConsolidatedFixedChargeCoverageRatio
Namespace Prefix: | iii_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Consolidated leverage ratio. + References No definition available. + Details
Name: | iii_ConsolidatedLeverageRatio
Namespace Prefix: | iii_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of quarterly installments in which the debt instrument principal is to be repaid. + References No definition available. + Details
Name: | iii_DebtInstrumentNumberOfQuarterlyInstallments
Namespace Prefix: | iii_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the percentage of net proceeds from issuances of debt and equity used for mandatory repayments of the debt. + References No definition available. + Details
Name: | iii_DebtInstrumentPercentageOfNetProceedsFromDebtAndEquityIssuanceForMandatoryRepaymentOfDebt
Namespace Prefix: | iii_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of net proceeds from insurance recovery and condemnation events used for mandatory repayments of the debt. + References No definition available. + Details
Name: | iii_DebtInstrumentPercentageOfNetProceedsFromInsuranceRecoveryAndCondemnationEventsUsedForMandatoryRepaymentOfDebt
Namespace Prefix: | iii_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of proceeds from asset sales used for mandatory repayments of the debt. + References No definition available. + Details
Name: | iii_DebtInstrumentPercentageOfProceedsFromAssetSalesUsedForMandatoryRepaymentOfDebt
Namespace Prefix: | iii_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum permitted leverage ratio. + References No definition available. + Details
Name: | iii_MaximumPermittedLeverageRatio
Namespace Prefix: | iii_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentDescriptionOfVariableRateBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 3: 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_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- 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

X
- Definition Amount of the required periodic payments including both interest and principal payments. + 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 210.5-02.22) -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 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
Name: | us-gaap_DebtInstrumentPeriodicPayment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + 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 210.5-02.17) -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 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
Name: | us-gaap_DeferredFinanceCostsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract. + References No definition available. + Details
Name: | us-gaap_DerivativeCapInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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(22)) -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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
Name: | us-gaap_LineOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_FederalFundsEffectiveSwapRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_EurodollarMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=iii_CreditAgreement2016Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |