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Fair Value Measurements (Details) (USD $)
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3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | ||||||||||||||||||||
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Jun. 30, 2012
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Dec. 31, 2011
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Jun. 30, 2012
Akimeka Acquisition [Member]
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Jun. 30, 2012
Akimeka Acquisition [Member]
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Jun. 30, 2012
WBI Acquisition [Member]
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Jun. 30, 2012
WBI Acquisition [Member]
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Jun. 30, 2012
Short Term Obligations [Member]
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Jun. 30, 2012
Long Term Earn Out Obligations [Member]
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Jun. 30, 2012
Other Assets [Member]
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Dec. 31, 2011
Other Assets [Member]
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Jun. 30, 2012
Accrued Expenses [Member]
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Dec. 31, 2011
Accrued Expenses [Member]
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Jun. 30, 2012
Current Portion of Earn Out Obligations [Member]
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Dec. 31, 2011
Current Portion of Earn Out Obligations [Member]
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Jun. 30, 2012
Earn-out Obligations [Member]
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Dec. 31, 2011
Earn-out Obligations [Member]
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Jun. 30, 2012
Fair Value, Inputs, Level 1 [Member]
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Dec. 31, 2011
Fair Value, Inputs, Level 1 [Member]
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Jun. 30, 2012
Fair Value, Inputs, Level 2 [Member]
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Dec. 31, 2011
Fair Value, Inputs, Level 2 [Member]
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Jun. 30, 2012
Fair Value, Inputs, Level 3 [Member]
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Dec. 31, 2011
Fair Value, Inputs, Level 3 [Member]
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Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
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Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||||||||||||||||
| Mutual funds held in DSC plan | $ 374,000 | $ 300,000 | $ 374,000 | $ 300,000 | $ 374,000 | $ 300,000 | ||||||||||||||||||
| Interest rate swaps | 1,478,000 | 1,122,000 | 1,478,000 | 1,122,000 | 1,478,000 | 1,122,000 | ||||||||||||||||||
| Current portion of earn-out obligations | 7,281,000 | 4,153,000 | 7,281,000 | 4,153,000 | 7,281,000 | 4,153,000 | 7,281,000 | 4,153,000 | ||||||||||||||||
| Earn-out obligation, less current portion | 12,574,000 | 16,415,000 | 12,574,000 | 16,415,000 | 12,574,000 | 16,415,000 | 12,574,000 | 16,415,000 | ||||||||||||||||
| Offset amount included in accumulated other comprehensive loss, net of tax | 565,000 | 429,000 | ||||||||||||||||||||||
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | ||||||||||||||||||||||||
| Balance as of December 31, 2011 | 4,153,000 | 16,415,000 | ||||||||||||||||||||||
| Fair value adjustment included in earnings | (713,000) | |||||||||||||||||||||||
| Reclassification from long-term to short-term | 3,128,000 | (3,128,000) | ||||||||||||||||||||||
| Balance as of June 30, 2012 | 7,281,000 | 12,574,000 | ||||||||||||||||||||||
| Business Acquisition [Line Items] | ||||||||||||||||||||||||
| Earn-out obligations payments, maximum obligation | 11,000,000 | 11,000,000 | ||||||||||||||||||||||
| Increase (decrease) in earn-out obligation | $ 967,000 | $ 1,900,000 | $ 806,000 | $ 1,200,000 | ||||||||||||||||||||