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Carrying Amount and Accumulated Amortization of Other Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 248,173 | $ 174,459
Accumulated Amortization | (54,359) | (46,559)
Net Balance | 193,814 | 127,900
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 228,183 | 157,364
Accumulated Amortization | (40,324) | (33,727)
Net Balance | 187,859 | 123,637
Purchased contracts |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 10,729 | 10,823
Accumulated Amortization | (10,691) | (10,549)
Net Balance | 38 | 274
Trademarks and tradenames |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 8,820 | 5,830
Accumulated Amortization | (3,098) | (2,096)
Net Balance | 5,722 | 3,734
Covenant not to compete |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 441 | 442
Accumulated Amortization | (246) | (187)
Net Balance | $ 195 | $ 255

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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