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Fair Value Measurements (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Rollforward of contingent consideration liability level three fair value measurements |  |  |
Change in fair value of contingent consideration | $ 1,435 | $ (2,927) | $ (290)
Contingent consideration |  |  |
Rollforward of contingent consideration liability level three fair value measurements |  |  |
Balance at the beginning of the period | 12,718 |  |
Change in fair value of contingent consideration | 2,015 |  |
Balance at the end of the period | 23,431 |  |
Additional information |  |  |
Number of unobservable inputs | 2 |  |
Minimum probability of acquired entity meeting contractual operating performance target | 75.00% |  |
Contingent consideration | Sprint acquisition |  |  |
Rollforward of contingent consideration liability level three fair value measurements |  |  |
Additions | 6,200 |  |
Contingent consideration | Saxon Group |  |  |
Rollforward of contingent consideration liability level three fair value measurements |  |  |
Additions | 1,950 |  |
Contingent consideration | Q3C acquisition |  |  |
Rollforward of contingent consideration liability level three fair value measurements |  |  |
Additions | 7,448 |  |
Contingent consideration | Rockford |  |  |
Rollforward of contingent consideration liability level three fair value measurements |  |  |
Reductions | $ (6,900) |  |

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- Definition Represents the minimum probability of acquired entity meeting the contractual operating performance target expressed as a percentage. + References No definition available. + Details
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- Definition Represents the number of unobservable inputs. + References No definition available. + Details
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- Definition This element represents the amount of any change, including any differences arising upon settlement, recognized during the reporting period in the value of a liability, arising from an item of contingent consideration, assumed in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e7008-128479 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 72 -Subparagraph b -Clause 1 -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 Purchases that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Sales that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition This element represents a liability measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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