Income Taxes - Schedule of Deferred Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Accrued expenses	$ 1,669dco_DeferredTaxAssetsAccruedExpenses	$ 428dco_DeferredTaxAssetsAccruedExpenses
Allowance for doubtful accounts	94	183
Contract overrun reserves	1,766dco_DeferredTaxAssetsLongTermContracts	3,920dco_DeferredTaxAssetsLongTermContracts
Deferred compensation	464	141
Employment-related accruals	5,375	2,982
Environmental reserves	778	778
Federal tax credit carryforwards	2,696	3,758
Inventory reserves	3,873	4,639
Investment in common stock	300us-gaap_DeferredTaxAssetsInvestments	300us-gaap_DeferredTaxAssetsInvestments
Pension obligation	3,959dco_DeferredTaxAssetsPension	2,297dco_DeferredTaxAssetsPension
State net operating loss carryforwards	1,065	995
State tax credit carryforwards	5,382	3,887
Stock-based compensation	2,082	1,444
Workers’ compensation	121	121
Other	1,072us-gaap_DeferredTaxAssetsOther	1,355us-gaap_DeferredTaxAssetsOther
Total gross deferred tax assets	30,696us-gaap_DeferredTaxAssetsGross	27,228us-gaap_DeferredTaxAssetsGross
Valuation allowance	(6,882)	(4,650)
Total gross deferred tax assets, net of valuation allowance	23,814us-gaap_DeferredTaxAssetsNet	22,578us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:
Depreciation	(12,485)dco_DeferredTaxLiabilitiesDepreciation	(12,396)dco_DeferredTaxLiabilitiesDepreciation
Goodwill	(12,105)	(9,200)
Intangibles	(51,755)	(54,227)
Prepaid insurance	(685)	(666)
Section 48(a) adjustment	(1,334)	0
Unbilled receivables	(1,115)	(1,409)
Total gross deferred tax liabilities	(79,479)us-gaap_DeferredIncomeTaxLiabilities	(77,898)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax liabilities	$ (55,665)us-gaap_DeferredTaxLiabilities	$ (55,320)us-gaap_DeferredTaxLiabilities

Deferred Tax Assets, Accrued Expenses

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Deferred Tax Assets Deferred Compensation

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Deferred Tax Assets Employee Related Obligations

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Deferred Tax Assets Environmental Reserves

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Deferred Tax Assets, Inventory Reserves and Valuation

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Deferred Tax Assets, Long term Contracts

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Deferred Tax Assets, Pension

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Deferred Tax Assets, Product Liability and Workers Compensation Reserves

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Deferred Tax Assets Share Based Compensation

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Deferred Tax Assets, Tax Credit Carryforwards, State

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Deferred Tax Liabilities, Depreciation

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Deferred Tax Liabilities, Section 48a Adjustment

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Deferred Tax Liabilities, Unbilled Receivables

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Amount of deferred tax liability attributable to taxable temporary differences.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from investments (excludes investments in subsidiaries and equity method investments).

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.

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The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance.

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Amount of deferred tax liability attributable to taxable temporary differences from goodwill.

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Amount of deferred tax liability attributable to taxable temporary differences from intangible assets other than goodwill.

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Amount of deferred tax consequences attributable to taxable temporary differences derived from prepaid expenses.

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