Maximum Product Warranty Term

No definition available.

Name:	hill_MaximumProductWarrantyTerm
Namespace Prefix:	hill_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of product rebates/price concessions under settlement agreement

+ References

No definition available.

+ Details

Name:	hill_PeriodOfProductRebatesPriceConcessionsUnderSettlementAgreement
Namespace Prefix:	hill_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Product Warranty, Reimbursement Receivable

+ References

No definition available.

+ Details

Name:	hill_ProductWarrantyReimbursementReceivable
Namespace Prefix:	hill_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Carrying amount as of the balance sheet date of amounts expected to be recovered under the terms of insurance contracts.

+ 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 210.5-02.17)

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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 17

-Article 5

+ Details

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

- Definition

Represents the aggregate decrease in the liability for payments made (in cash or in kind) to satisfy claims under the terms of the extended product warranty. Does not include any Increase or Decrease in the liability for payments related to standard product warranties.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

+ Details

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

- Details

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

- Definition

Recorded amount of the accrual for a material component of a product liability contingency.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 5.Y.Q2)

-URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751

+ Details

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

- Details

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

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.15(5))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Subparagraph 5

-Article 9

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(5))

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

+ Details

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

- Definition

Represents the aggregate Increase or Decrease in the liability during the reporting period for accruals related to preexisting standard and extended product warranties (including adjustments for changes in estimates).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(4))

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

+ Details

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

- Definition

Represents the aggregate increase in the liability for accruals related to standard product warranties issued during the reporting period. Does not include any increase in the liability for accruals related to extended product warranties.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(3))

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

+ Details

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

- Details

Name:	us-gaap_MajorCustomersAxis=hill_MaterialCustomerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Product Warranties (Details) (USD $)	3 Months Ended	12 Months Ended			3 Months Ended
Product Warranties (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2012
Product Liability Contingency [Line Items]
Maximum product warranty term		3 years
Warranty accrual		$ 3,363,000us-gaap_ProductWarrantyAccrual	$ 2,965,000us-gaap_ProductWarrantyAccrual	$ 4,455,000us-gaap_ProductWarrantyAccrual
Estimated product warranty liability		100,000
Reimbursement receivable			1,200,000
Period of product rebates/price concessions under settlement agreement			39 months
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance, beginning of period	4,455,000us-gaap_ProductWarrantyAccrual	2,965,000us-gaap_ProductWarrantyAccrual	4,455,000us-gaap_ProductWarrantyAccrual	6,871,000us-gaap_ProductWarrantyAccrual
Charges to operations		1,770,000	1,350,000	2,116,000
Deductions for costs incurred		(1,372,000)	(2,840,000)	(4,532,000)
Balance, end of period		3,363,000us-gaap_ProductWarrantyAccrual	2,965,000us-gaap_ProductWarrantyAccrual	4,455,000us-gaap_ProductWarrantyAccrual
Decrease in warrant accrual due to more favorable rates with a third-party service provider	800,000
Estimated Insurance Recoveries		100,000us-gaap_EstimatedInsuranceRecoveries
Material Customer [Member]
Movement in Standard Product Warranty Accrual [Roll Forward]
Deductions for costs incurred					$ (2,000,000)