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

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Section 35

-Paragraph 50

-URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930

+ Details

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

- Definition

Target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(i)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)(i)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920

+ Details

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

- Definition

Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

+ Details

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

- Definition

Fair Value, Level 3 Transfers out and Reinvested to Level 2

+ References

No definition available.

+ Details

Name:	xrm_FairValueLevel3TransfersoutandReinvestedtoLevel2
Namespace Prefix:	xrm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_FixedIncomeFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=xrm_MarketableEquityFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=country_CA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=country_GB
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Pensions, Other Post Retirement and Post Employment Benefits - Plan Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Plan asset allocation	100.00%	100.00%
Marketable equities
Defined Benefit Plan Disclosure [Line Items]
Plan asset allocation	56.00%	60.00%
Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Plan asset allocation	44.00%	40.00%
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	39,708
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	236	3,027
Fair value level 3 sold and reinvested to Level 2	2,800
United States
Defined Benefit Plan Disclosure [Line Items]
Plan asset allocation	73.00%
United States \| Marketable equities
Defined Benefit Plan Disclosure [Line Items]
Plan asset allocation	48.00%
United States \| Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Plan asset allocation	52.00%
United States \| Equity investments
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations	55.00%
United States \| Bond Investment
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations	45.00%
United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Plan asset allocation	81.00%
United Kingdom \| Marketable equities
Defined Benefit Plan Disclosure [Line Items]
Plan asset allocation	36.00%
United Kingdom \| Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Plan asset allocation	67.00%
United Kingdom \| Equity investments
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations	50.00%
United Kingdom \| Bond Investment
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations	50.00%
United Kingdom \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	32,008
Canada
Defined Benefit Plan Disclosure [Line Items]
Plan asset allocation	59.00%
Canada \| Marketable equities
Defined Benefit Plan Disclosure [Line Items]
Plan asset allocation	55.00%
Canada \| Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Plan asset allocation	43.00%
Canada \| Equity investments
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations	66.00%
Canada \| Bond Investment
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations	32.00%
Canada \| Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan asset allocation	2.00%
Target plan asset allocations	2.00%
Canada \| Balanced Pension Trust Series O
Defined Benefit Plan Disclosure [Line Items]
Plan asset allocation	85.00%
Canada \| U.S. Pooled Pension Fund Series O
Defined Benefit Plan Disclosure [Line Items]
Plan asset allocation	15.00%
Canada \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	25,292