The percent per annum of the original principal amount required as a principal payment on the loan.

No definition available.

Name:	hdsn_AnnualPrincipalPaymentPercentage
Namespace Prefix:	hdsn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of basis points increase in loan interest rate.

+ References

No definition available.

+ Details

Name:	hdsn_BasisPointIncreaseInInterestRate
Namespace Prefix:	hdsn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the calculated interest rate dependent on average quarterly undrawn availability.

+ References

No definition available.

+ Details

Name:	hdsn_DebtInstrumentAdditionalPercentagePointsInterest
Namespace Prefix:	hdsn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The percentage applied to the outstanding balance to arrive at the fee required to be paid to exit the loan.

+ References

No definition available.

+ Details

Name:	hdsn_DebtInstrumentExitFeePercentage
Namespace Prefix:	hdsn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the information pertaining to leverage ratio of the company, as calculated.

+ References

No definition available.

+ Details

Name:	hdsn_DebtInstrumentLeverageRatioActual
Namespace Prefix:	hdsn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the information pertaining to leverage ratio, required.

+ References

No definition available.

+ Details

Name:	hdsn_DebtInstrumentLeverageRatioRequired
Namespace Prefix:	hdsn_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Prepayment premium percentage in year four and thereafter.

+ References

No definition available.

+ Details

Name:	hdsn_DebtPrepaymentPremiumPercentageYearFourAndThereafter
Namespace Prefix:	hdsn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Prepayment premium percentage in year three.

+ References

No definition available.

+ Details

Name:	hdsn_DebtPrepaymentPremiumPercentageYearThree
Namespace Prefix:	hdsn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Prepayment premium percentage in year two.

+ References

No definition available.

+ Details

Name:	hdsn_DebtPrepaymentPremiumPercentageYearTwo
Namespace Prefix:	hdsn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the information pertaining to deferred financing costs.

+ References

No definition available.

+ Details

Name:	hdsn_DeferredFinancingCosts
Namespace Prefix:	hdsn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of ebitda reported during the year.

+ References

No definition available.

+ Details

Name:	hdsn_EarningsBeforeInterestTaxDepreciationAndAmortization
Namespace Prefix:	hdsn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Fixed charge coverage ratio reported during the year.

+ References

No definition available.

+ Details

Name:	hdsn_FixedChargesCoverageRatio
Namespace Prefix:	hdsn_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

The minimum aggregate undrawn term loan availability used to determine percentage of excess cash flow to be used to paydown the loan.

+ References

No definition available.

+ Details

Name:	hdsn_MinimumAggregateUndrawnLoanAvailability
Namespace Prefix:	hdsn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The required one time waiver fee as a percent of the outstanding loan balance.

+ References

No definition available.

+ Details

Name:	hdsn_OneTimeWaiverFeePercentage
Namespace Prefix:	hdsn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount, at the Borrower's option, of a loan principal prepayment.

+ References

No definition available.

+ Details

Name:	hdsn_OptionalDebtPrepayment
Namespace Prefix:	hdsn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The percentage of excess cash flow used to calculate the required additional annual principal payment.

+ References

No definition available.

+ Details

Name:	hdsn_PercentageExcessCashFlow
Namespace Prefix:	hdsn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Indebtedness divided by net capitals.

+ References

No definition available.

+ Details

Name:	hdsn_RatiosOfIndebtednessToNetCapital
Namespace Prefix:	hdsn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Indebtedness divided by net capital required to maintain.

+ References

No definition available.

+ Details

Name:	hdsn_RatiosOfIndebtednessToNetCapitalRequirement
Namespace Prefix:	hdsn_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

The reduction in the exit fee percentage in the event the loan is repaid in full or in part according to conditions.

+ References

No definition available.

+ Details

Name:	hdsn_ReductionInExitFeePercentageSubjectToCertainConditions
Namespace Prefix:	hdsn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of voluntary prepayments of debt to which the exit fee reduction percentage is applied to arrive at the amount of the exit fee.

+ References

No definition available.

+ Details

Name:	hdsn_ThresholdAmountOfVoluntaryPrepaymentsToWhichExitFeeReductionIsApplied
Namespace Prefix:	hdsn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45014-112735

+ Details

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

- 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

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: 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 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

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

- Definition

Amount of the fee that accompanies borrowing money under the debt instrument.

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

+ Details

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

- Definition

Contractual interest rate for funds borrowed, under the debt 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(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

Amount of deferred tax liability attributable to taxable temporary differences from debt issuance costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 25
-Paragraph 20
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=117330534&loc=d3e28680-109314

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319

+ Details

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

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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

- Definition

Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The effective interest rate at the end of the reporting 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 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- 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

- Definition

Amount of the required periodic payment applied to principal.

+ 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_LineOfCreditFacilityPeriodicPaymentPrincipal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ 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_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=hdsn_FCCRMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=hdsn_TLRMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=hdsn_AmendedAndRestatedRevolvingCreditAndSecurityAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=hdsn_LondonInterbankOfferedRateDailyLiborMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_FederalFundsPurchasedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=hdsn_TermLoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=hdsn_WaiverAndSecondAmendmentToTermLoanCreditAndSecurityAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=hdsn_RepaymentOfLoansInFullOccurringBetweenJanuary12020AndPriorToMarch312020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=hdsn_WaiverAndThirdAmendmentToTermLoanCreditAndSecurityAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=hdsn_AdditionalPrincipalRepaymentOnOrBeforeNovember142019MinimumUndrawnAvailabilityGreaterThan35000000Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=hdsn_AdditionalPrincipalRepaymentOnOrBeforeNovember142019MinimumUndrawnAvailabilityGreaterThan15000000LessThan35000000Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=hdsn_AdditionalPrincipalRepaymentOnOrBeforeNovember142019MinimumUndrawnAvailabilityLessThan15000000Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=hdsn_VoluntaryPrepaymentsOfLoansMadePriorToJanuary12020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_CreditFacilityAxis=hdsn_SecondAmendmentToAmendedAndRestatedRevolvingCreditAndSecurityAgreementConsentAndWaiverMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=hdsn_VehicleAndEquipmentLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=hdsn_TermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=hdsn_SecondAmendmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=hdsn_PncBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=hdsn_SwingLineLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=hdsn_DomesticRateLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=hdsn_EurodollarRateLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Short-term and long-term debt - Additional Information (Details)				1 Months Ended	3 Months Ended						6 Months Ended		9 Months Ended	12 Months Ended
	Oct. 01, 2019	Nov. 30, 2018 USD ($)	Oct. 10, 2017 USD ($)	Nov. 30, 2018 USD ($)	Mar. 31, 2020	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2019 USD ($)	Dec. 31, 2019	Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	Nov. 30, 2019 USD ($)	Jul. 31, 2019 USD ($)	Aug. 14, 2018	Jul. 01, 2018
Debt Instrument, Leverage Ratio, Actual													$ 13.79		$ 0.40
Debt Instrument, Leverage Ratio, Required													6.40
Line of Credit Facility, Remaining Borrowing Capacity						$ 23,200,000							$ 23,200,000		23,200,000			$ 23,200,000
Line of Credit Facility, Maximum Borrowing Capacity																		$ 28,000,000
Capital leased assets gross						$ 0.03							$ 0.03		$ 0.03
Earnings Before Interest , Tax ,Depreciation And Amortization							$ 14,195,000	$ 9,270,000	$ 9,428,000	$ 9,240,000
Ratios Of Indebtedness To Net Capital Requirement													4.75
Ratios Of Indebtedness To Net Capital					4:75			12.95:		12.45	8.25	10.15	6.40	5:70		12.75
Deferred Tax Liabilities, Deferred Expense, Debt Issuance Costs		$ 250,000		$ 250,000
Debt Instrument, Fee Amount		250,000		250,000
FCCR [Member]
Fixed Charges Coverage Ratio						1.00
TLR [Member]
Ratios Of Indebtedness To Net Capital													13.79			11.82
Amended And Restated Revolving Credit And Security Agreement \| London Interbank Offered Rate Daily Libor [Member]
Debt Instrument, Basis Spread on Variable Rate													1.00%
Amended And Restated Revolving Credit And Security Agreement \| Federal Funds Purchased [Member]
Debt Instrument, Basis Spread on Variable Rate													0.50%
Term Loan Facility [Member]
Debt Instrument, Leverage Ratio, Required																2.75
Percent per annum						1.00%							1.00%		1.00%
Prepayment premium percentage year two									3.00%							3.00%
Prepayment premium percentage year three									1.00%							1.00%
Prepayment premium percentage year four and thereafter									0.00%							0.00%
Second Amendment
Basis points increase in interest rate																				3.00%
Exit fee percentage																			3.00%
One time waiver fee percentage																			1.00%
Second Amendment \| Repayment Of Loans In Full Occurring Between January 1 2020 And Prior To March 31 2020 [Member]
Reduction in exit fee percentage																			1.50%
Third Amendment
Line of Credit Facility, Remaining Borrowing Capacity		28,000,000		28,000,000
Exit fee percentage																	5.00%
Line of Credit Facility, Periodic Payment, Principal		$ 525,000
Third Amendment \| Additional Principal Repayment On Or Before November 14 2019 Minimum Undrawn Availability Greater Than $35000000 [Member]
Percentage Excess Cash Flow		100.00%
Third Amendment \| Additional Principal Repayment On Or Before November 14 2019 Minimum Undrawn Availability Greater Than 15000000 Less Than 35000000 [Member]
Percentage Excess Cash Flow		50.00%
Third Amendment \| Additional Principal Repayment On Or Before November 14 2019 Minimum Undrawn Availability Less Than 15000000 [Member
Percentage Excess Cash Flow		0.00%
Third Amendment \| Voluntary Prepayments Of Loans Made Prior to January 1 2020 [Member]
Reduction in exit fee percentage																	0.10%
Voluntary prepayment sharehold amount																	$ 1,000,000
Third Amendment \| Repayment Of Loans In Full Occurring Between January 1 2020 And Prior To March 31 2020 [Member]
Reduction in exit fee percentage																	50.00%
Minimum \| Amended And Restated Revolving Credit And Security Agreement
Additional interest percentage						0.50%							0.50%		0.50%
Minimum \| Amended And Restated Revolving Credit And Security Agreement \| Euro Dollar
Debt Instrument, Basis Spread on Variable Rate													1.50%
Minimum \| Second Revolver Amendment \| Euro Dollar
Debt Instrument, Basis Spread on Variable Rate	2.50%
Minimum \| Third Amendment
Exit fee percentage																	3.00%
Minimum \| Third Amendment \| Additional Principal Repayment On Or Before November 14 2019 Minimum Undrawn Availability Greater Than $35000000 [Member]
Minimum aggregate undrawn loan availability		$ 35,000,000
Minimum \| Third Amendment \| Additional Principal Repayment On Or Before November 14 2019 Minimum Undrawn Availability Greater Than 15000000 Less Than 35000000 [Member]
Minimum aggregate undrawn loan availability		15,000,000
Maximum \| Amended And Restated Revolving Credit And Security Agreement
Additional interest percentage						1.00%							1.00%		1.00%
Maximum \| Amended And Restated Revolving Credit And Security Agreement \| Euro Dollar
Debt Instrument, Basis Spread on Variable Rate													2.00%
Maximum \| Second Revolver Amendment \| Euro Dollar
Debt Instrument, Basis Spread on Variable Rate	3.00%
Maximum \| Term Loan Facility [Member]
Percentage Excess Cash Flow																50.00%
Principal prepayment									$ 30,000,000							$ 30,000,000
Maximum \| Third Amendment \| Additional Principal Repayment On Or Before November 14 2019 Minimum Undrawn Availability Greater Than 15000000 Less Than 35000000 [Member]
Minimum aggregate undrawn loan availability		35,000,000
Maximum \| Third Amendment \| Additional Principal Repayment On Or Before November 14 2019 Minimum Undrawn Availability Less Than 15000000 [Member
Minimum aggregate undrawn loan availability		$ 15,000,000
Vehicle and Equipment Loans
Line of Credit Facility, Expiration Period													60 months
Vehicle and Equipment Loans \| Minimum
Credit facility effective rate of interest						0.00%							0.00%		0.00%
Vehicle and Equipment Loans \| Maximum
Credit facility effective rate of interest						8.30%							8.30%		8.30%
Term Loan
Line of Credit Facility, Maximum Borrowing Capacity			$ 25,000,000
Debt Instrument, Face Amount			$ 105,000,000
Term Loan \| Second Amendment [Member]
Deferred Financing Costs				$ 1,000,000
Term Loan \| Euro Dollar
Debt Instrument, Basis Spread on Variable Rate			7.25%
Debt Instrument, Interest Rate, Stated Percentage			3.00%
PNC Bank [Member]
Letters of Credit Outstanding, Amount						$ 130,000							$ 130,000		$ 130,000
Debt Instrument, Face Amount						$ 15,200,000							$ 15,200,000		$ 15,200,000
PNC Bank [Member] \| Amended And Restated Revolving Credit And Security Agreement
Line of Credit Facility, Maximum Borrowing Capacity			$ 150,000,000
PNC Bank [Member] \| Swing Line Loan [Member]
Line of Credit Facility, Maximum Borrowing Capacity			15,000,000
PNC Bank [Member] \| Letter of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity			$ 5,000,000
Domestic Rate Loans [Member] \| Second Revolver Amendment \| Base Rate [Member]
Debt Instrument, Basis Spread on Variable Rate		2.00%
Eurodollar Rate Loans [Member] \| Second Revolver Amendment \| Euro Dollar
Debt Instrument, Basis Spread on Variable Rate		3.00%
Eurodollar Rate Loans [Member] \| Minimum \| Second Revolver Amendment
Debt Instrument, Basis Spread on Variable Rate	1.50%
Eurodollar Rate Loans [Member] \| Maximum \| Second Revolver Amendment
Debt Instrument, Basis Spread on Variable Rate	2.00%