Subsequent Events - Additional Information (Detail) - USD ($)	Apr. 10, 2017	Sep. 30, 2014
Credit Agreement [Member] \| Maximum [Member] \| Secured Credit Facilities [Member]
Subsequent Event [Line Items]
Issuance of secured secured notes		$ 160,000,000
Subsequent Event [Member] \| 8.0% Senior Secured Notes due 2024 [Member]
Subsequent Event [Line Items]
Issuance of secured secured notes	$ 250,000,000
Notes bears interest rate	8.00%
Debt instrument, maturity year	2024
Debt instrument, frequency of periodic payment	semi-annually
Interest payment beginning date	Oct. 01, 2017
Maximum aggregate indebtedness outstanding	$ 50,000,000
Debt instrument, change in control offers to purchase principal amount percentage	101.00%
Subsequent Event [Member] \| 8.0% Senior Secured Notes due 2024 [Member] \| Any Time Before April 1, 2020 [Member] \| Redemption Price Plus "Make-Whole" Premium and Accrued and Unpaid Interest [Member]
Subsequent Event [Line Items]
Debt redemption price percentage of principal amount	100.00%
Subsequent Event [Member] \| 8.0% Senior Secured Notes due 2024 [Member] \| Any Time Before April 1, 2020 [Member] \| Redemption Price Plus Accrued and Unpaid Interest [Member] \| Maximum [Member]
Subsequent Event [Line Items]
Debt redemption price percentage of principal amount	35.00%
Subsequent Event [Member] \| Credit Agreement [Member] \| Secured Credit Facilities [Member]
Subsequent Event [Line Items]
Termination of outstanding credit facilities	$ 150,000,000
Early termination penalty	$ 1,500,000

Debt instrument change in control offers to purchase principal amount percentage.

No definition available.

Name:	orbc_DebtInstrumentChangeInControlOffersToPurchasePrincipalAmountPercentage
Namespace Prefix:	orbc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt instrument maturity year.

+ References

No definition available.

+ Details

Name:	orbc_DebtInstrumentMaturityYear
Namespace Prefix:	orbc_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum indebtedness under potential new credit facilities in aggregate principal amount.

+ References

No definition available.

+ Details

Name:	orbc_MaximumIndebtednessUnderPotentialNewCreditFacilitiesInAggregatePrincipalAmount
Namespace Prefix:	orbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Date the debt agreement requires the first payment to be made, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-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

+ Details

Name:	us-gaap_DebtInstrumentDateOfFirstRequiredPayment1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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

- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

+ References

+ Details

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

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash outflow for incremental, external costs directly pertaining to an early extinguishment of debt, including legal costs and prepayment penalties, and excluding interest and repayment of debt principal.

+ References

No definition available.

+ Details

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

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

No definition available.

+ Details

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

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
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- Details

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

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

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

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodOneMember
Namespace Prefix:
Data Type:	na
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- Details

Name:	us-gaap_TransactionTypeAxis=orbc_RedemptionPricePlusMakeWholePremiumAndAccruedAndUnpaidInterestMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TransactionTypeAxis=orbc_RedemptionPricePlusAccruedAndUnpaidInterestMember
Namespace Prefix:
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