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Acquisitions (Details) (USD $)
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3 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||||||||
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2011
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Sep. 30, 2011
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Jun. 30, 2011
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Mar. 31, 2011
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2012
Trade Name [Member]
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Dec. 31, 2012
WBI [Member]
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Jun. 06, 2011
WBI [Member]
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Dec. 31, 2012
Akimeka, LLC [Member]
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Dec. 31, 2010
Akimeka, LLC [Member]
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Aug. 19, 2010
Akimeka, LLC [Member]
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| Business Acquisition [Line Items] | |||||||||||||||||
| Cost of acquired entity, cash paid | $ 180,000,000 | $ 33,000,000 | |||||||||||||||
| Prepaid employee compensation | 1,900,000 | 725,000 | |||||||||||||||
| Acquisition cost, net of retention bonuses | 178,100,000 | 32,300,000 | |||||||||||||||
| Revenue of acquisition | 148,073,000 | 90,684,000 | 12,973,000 | ||||||||||||||
| Operating income | 11,764,000 | 14,267,000 | 12,552,000 | 12,493,000 | 11,113,000 | 11,228,000 | 7,059,000 | 6,677,000 | 51,076,000 | 36,077,000 | 37,940,000 | ||||||
| Income taxes paid to sellers | 10,686,000 | 12,625,000 | 15,466,000 | ||||||||||||||
| Maximum potential cash payment | 40,000,000 | 11,000,000 | |||||||||||||||
| Period of Additional Payments to Sellers | 4 | 3 | |||||||||||||||
| Earn-out obligations, less current portion | 9,100,000 | ||||||||||||||||
| Earn-out obligation adjustment | 4,337,000 | 2,486,000 | 0 | ||||||||||||||
| Acquired Finite-Lived Intangible Assets [Line Items] | |||||||||||||||||
| Useful Life of intangible assets | 8 years 9 months 18 days | ||||||||||||||||
| Acquisition date fair value of earn-out obligation | 9,098,000 | 16,415,000 | 9,098,000 | 16,415,000 | |||||||||||||
| Additional cash consideration based on final working capital calculation | 3,000,000 | 363,000 | |||||||||||||||
| Earn-out payments | (7,133,000) | 7,100,000 | |||||||||||||||
| Earn Out Obligations Fair Value Disclosure | $ 9,098,000 | $ 16,415,000 | $ 9,098,000 | $ 16,415,000 | |||||||||||||