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Business Segments and Customer Information (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Segment Reporting Information [Line Items] |  |  |
Number of reportable operating segments | 4 |  |
Revenues | $ 546,755 | $ 580,762 | $ 810,955
Income before income taxes | 43,852 | 32,392 | 37,741
Interest (income) expense, net | 7,224 | 3,685 | 199
Depreciation and amortization expense | 19,795 | 13,467 | 7,589
Capital expenditures | 20,863 | 6,635 | 4,805
Total assets | 410,211 | 454,512 |
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | 546,755 | 580,762 | 810,955
Percentage of revenue by customer (in dollars per share) | 10000.00% | 10000.00% | 10000.00%
U.S. Army/Army Reserve [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 182,412 | 231,615 | 463,378
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | 182,412 | 231,615 | 463,378
Percentage of revenue by customer (in dollars per share) | 3340.00% | 3990.00% | 5710.00%
U.S. Navy [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 120,867 | 140,551 | 198,833
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | 120,867 | 140,551 | 198,833
Percentage of revenue by customer (in dollars per share) | 2210.00% | 2420.00% | 2450.00%
U.S. Air Force [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 6,963 | 11,971 | 13,304
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | 6,963 | 11,971 | 13,304
Percentage of revenue by customer (in dollars per share) | 130.00% | 200.00% | 170.00%
Total Department of Defense [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 310,242 | 384,137 | 675,515
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | 310,242 | 384,137 | 675,515
Percentage of revenue by customer (in dollars per share) | 5680.00% | 6610.00% | 8330.00%
U.S. Postal Service [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 130,866 | 75,964 | 0
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | 130,866 | 75,964 | 0
Percentage of revenue by customer (in dollars per share) | 2390.00% | 1310.00% | 0.00%
Department of U.S. Treasury [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 33,369 | 41,434 | 49,332
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | 33,369 | 41,434 | 49,332
Percentage of revenue by customer (in dollars per share) | 610.00% | 710.00% | 610.00%
Department of Interior [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 16,884 | 24,254 | 29,810
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | 16,884 | 24,254 | 29,810
Percentage of revenue by customer (in dollars per share) | 310.00% | 420.00% | 370.00%
Department of Energy [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 20,898 | 23,010 | 21,717
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | 20,898 | 23,010 | 21,717
Percentage of revenue by customer (in dollars per share) | 380.00% | 400.00% | 270.00%
Other government [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 32,231 | 28,160 | 29,598
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | 32,231 | 28,160 | 29,598
Percentage of revenue by customer (in dollars per share) | 590.00% | 480.00% | 360.00%
Total Federal civilian agencies [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 234,248 | 192,822 | 130,457
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | 234,248 | 192,822 | 130,457
Percentage of revenue by customer (in dollars per share) | 4280.00% | 3320.00% | 1610.00%
Commercial [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 2,265 | 3,803 | 4,983
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | 2,265 | 3,803 | 4,983
Percentage of revenue by customer (in dollars per share) | 40.00% | 70.00% | 60.00%
Federal Group [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 140,424 | 184,147 | 454,660
Income before income taxes | 10,130 | 6,099 | 20,574
Interest (income) expense, net | 291 | (75) | (31)
Depreciation and amortization expense | 3,093 | 2,906 | 4,115
Capital expenditures | 763 | 547 | 496
Total assets | 30,130 | 29,653 |
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | 140,424 | 184,147 | 454,660
International Group [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 167,193 | 206,746 | 261,499
Income before income taxes | 5,604 | 5,342 | 9,376
Interest (income) expense, net | 448 | (21) | 197
Depreciation and amortization expense | 3,035 | 1,903 | 1,521
Capital expenditures | 83 | 573 | 816
Total assets | 31,485 | 49,734 |
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | 167,193 | 206,746 | 261,499
IT, Energy and Management Consulting Group [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 94,225 | 106,817 | 94,796
Income before income taxes | 11,802 | 12,440 | 10,275
Interest (income) expense, net | 14 | (73) | (49)
Depreciation and amortization expense | 3,753 | 3,256 | 1,953
Capital expenditures | 53 | 236 | 305
Total assets | 64,502 | 70,108 |
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | 94,225 | 106,817 | 94,796
Infrastructure Group [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | 0 | 27,372 |
Supply Chain Management Group [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 144,913 | 83,052 | 0
Income before income taxes | 23,282 | 15,965 | 0
Interest (income) expense, net | 729 | 350 | 0
Depreciation and amortization expense | 9,914 | 5,402 | 0
Capital expenditures | 341 | 113 | 0
Total assets | 193,214 | 203,241 |
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | 144,913 | 83,052 | 0
Corporate/unallocated [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Income before income taxes | (6,966) | (7,454) | (2,484)
Interest (income) expense, net | 5,742 | 3,504 | 82
Capital expenditures | 19,623 | 5,166 | 3,188
Total assets | $ 90,880 | $ 74,404 |

X
- Definition Total expenditures for additions to long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets of the reportable segment; if the amount: (a) is included in the determination of segment assets reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in the determination of segment assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 28 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 5 + Details
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- Definition The net amount of operating interest income (expense). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.10) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 10 -Article 9 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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