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Income Taxes - Components of Pre-tax Income and Comprehensive Provision for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Provision for income taxes: |  |  |
Deferred income tax expense (benefit) | $ 468 us-gaap_DeferredIncomeTaxExpenseBenefit | $ 916 us-gaap_DeferredIncomeTaxExpenseBenefit | $ (7,713)us-gaap_DeferredIncomeTaxExpenseBenefit
Tax provision attributable to continuing operations | 5,012 us-gaap_IncomeTaxExpenseBenefit | 3,226 us-gaap_IncomeTaxExpenseBenefit | 1,415 us-gaap_IncomeTaxExpenseBenefit
Tax provision attributable to continuing operations | 5,012 us-gaap_IncomeTaxExpenseBenefit | 3,226 us-gaap_IncomeTaxExpenseBenefit | 1,415 us-gaap_IncomeTaxExpenseBenefit
Comprehensive provision for income tax allocable to: |  |  |
Tax provision attributable to continuing operations | 5,012 us-gaap_IncomeTaxExpenseBenefit | 3,226 us-gaap_IncomeTaxExpenseBenefit | 1,415 us-gaap_IncomeTaxExpenseBenefit
Discontinued operations |  |  | 3,484 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
Tax Provision Excluding Discontinued Operations |  |  |
Provision for income taxes: |  |  |
Currently payable | 4,544 us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_IncomeStatementLocationAxis = cix_TaxProvisionExcludingDiscontinuedOperationsMember | 2,310 us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_IncomeStatementLocationAxis = cix_TaxProvisionExcludingDiscontinuedOperationsMember | 1,633 us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_IncomeStatementLocationAxis = cix_TaxProvisionExcludingDiscontinuedOperationsMember
Deferred income tax expense (benefit) | 468 us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_IncomeStatementLocationAxis = cix_TaxProvisionExcludingDiscontinuedOperationsMember | 916 us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_IncomeStatementLocationAxis = cix_TaxProvisionExcludingDiscontinuedOperationsMember | (218)us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_IncomeStatementLocationAxis = cix_TaxProvisionExcludingDiscontinuedOperationsMember
Tax provision attributable to continuing operations | 5,012 us-gaap_IncomeTaxExpenseBenefit / us-gaap_IncomeStatementLocationAxis = cix_TaxProvisionExcludingDiscontinuedOperationsMember | 3,226 us-gaap_IncomeTaxExpenseBenefit / us-gaap_IncomeStatementLocationAxis = cix_TaxProvisionExcludingDiscontinuedOperationsMember | 1,415 us-gaap_IncomeTaxExpenseBenefit / us-gaap_IncomeStatementLocationAxis = cix_TaxProvisionExcludingDiscontinuedOperationsMember
Expected tax expense, at the U.S. federal statutory income tax rate of 35% | 4,787 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / us-gaap_IncomeStatementLocationAxis = cix_TaxProvisionExcludingDiscontinuedOperationsMember | 3,234 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / us-gaap_IncomeStatementLocationAxis = cix_TaxProvisionExcludingDiscontinuedOperationsMember | 1,729 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / us-gaap_IncomeStatementLocationAxis = cix_TaxProvisionExcludingDiscontinuedOperationsMember
State income taxes and other, net | 627 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes / us-gaap_IncomeStatementLocationAxis = cix_TaxProvisionExcludingDiscontinuedOperationsMember | 294 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes / us-gaap_IncomeStatementLocationAxis = cix_TaxProvisionExcludingDiscontinuedOperationsMember | 173 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes / us-gaap_IncomeStatementLocationAxis = cix_TaxProvisionExcludingDiscontinuedOperationsMember
Tax credits | (378)us-gaap_IncomeTaxReconciliationTaxCredits / us-gaap_IncomeStatementLocationAxis = cix_TaxProvisionExcludingDiscontinuedOperationsMember | (200)us-gaap_IncomeTaxReconciliationTaxCredits / us-gaap_IncomeStatementLocationAxis = cix_TaxProvisionExcludingDiscontinuedOperationsMember | (170)us-gaap_IncomeTaxReconciliationTaxCredits / us-gaap_IncomeStatementLocationAxis = cix_TaxProvisionExcludingDiscontinuedOperationsMember
Valuation allowance | (24)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance / us-gaap_IncomeStatementLocationAxis = cix_TaxProvisionExcludingDiscontinuedOperationsMember | (102)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance / us-gaap_IncomeStatementLocationAxis = cix_TaxProvisionExcludingDiscontinuedOperationsMember | (317)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance / us-gaap_IncomeStatementLocationAxis = cix_TaxProvisionExcludingDiscontinuedOperationsMember
Tax provision attributable to continuing operations | 5,012 us-gaap_IncomeTaxExpenseBenefit / us-gaap_IncomeStatementLocationAxis = cix_TaxProvisionExcludingDiscontinuedOperationsMember | 3,226 us-gaap_IncomeTaxExpenseBenefit / us-gaap_IncomeStatementLocationAxis = cix_TaxProvisionExcludingDiscontinuedOperationsMember | 1,415 us-gaap_IncomeTaxExpenseBenefit / us-gaap_IncomeStatementLocationAxis = cix_TaxProvisionExcludingDiscontinuedOperationsMember
Comprehensive provision for income tax allocable to: |  |  |
Tax provision attributable to continuing operations | 5,012 us-gaap_IncomeTaxExpenseBenefit / us-gaap_IncomeStatementLocationAxis = cix_TaxProvisionExcludingDiscontinuedOperationsMember | 3,226 us-gaap_IncomeTaxExpenseBenefit / us-gaap_IncomeStatementLocationAxis = cix_TaxProvisionExcludingDiscontinuedOperationsMember | 1,415 us-gaap_IncomeTaxExpenseBenefit / us-gaap_IncomeStatementLocationAxis = cix_TaxProvisionExcludingDiscontinuedOperationsMember
Discontinued operations |  |  | 5,397 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation / us-gaap_IncomeStatementLocationAxis = cix_TaxProvisionExcludingDiscontinuedOperationsMember
Total | $ 5,012 us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation / us-gaap_IncomeStatementLocationAxis = cix_TaxProvisionExcludingDiscontinuedOperationsMember | $ 3,226 us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation / us-gaap_IncomeStatementLocationAxis = cix_TaxProvisionExcludingDiscontinuedOperationsMember | $ 6,812 us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation / us-gaap_IncomeStatementLocationAxis = cix_TaxProvisionExcludingDiscontinuedOperationsMember

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- Definition Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6509736 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Subsection 7 + Details
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- Definition Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Subsection 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6510177 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32672-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=18498875&loc=d3e38679-109324 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition The sum of income tax expense or benefit for the period that has been allocated among continuing operations, discontinued operations, extraordinary items, other comprehensive income, and items charged or credited directly to shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=18498875&loc=d3e38679-109324 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32123-109318 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1 -Article 4 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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