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Carrying Amount of Other Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross amount | $ 529,020 | $ 520,693 | $ 516,897
Accumulated amortization | (144,645) | (117,523) | (67,983)
Net carrying amount | 384,375 | 403,170 | 448,914
Customer Relationships |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Useful life in years | 14 years | 14 years | 14 years
Gross amount | 314,093 | 313,726 | 313,543
Accumulated amortization | (61,975) | (50,769) | (28,372)
Net carrying amount | 252,118 | 262,957 | 285,171
Trademarks |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross amount | 39,950 | 39,950 | 39,950
Accumulated amortization | (9,526) | (7,794) | (4,330)
Net carrying amount | 30,424 | 32,156 | 35,620
Trademarks | Minimum |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Useful life in years | 10 years | 10 years | 10 years
Trademarks | Maximum |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Useful life in years | 15 years | 15 years | 15 years
Software packages |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross amount | 118,438 | 110,478 | 106,865
Accumulated amortization | (62,779) | (50,479) | (30,569)
Net carrying amount | 55,659 | 59,999 | 76,296
Software packages | Minimum |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Useful life in years | 3 years | 3 years | 3 years
Software packages | Maximum |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Useful life in years | 5 years | 5 years | 5 years
Noncompete Agreements |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Useful life in years | 15 years | 15 years | 15 years
Gross amount | 56,539 | 56,539 | 56,539
Accumulated amortization | (10,365) | (8,481) | (4,712)
Net carrying amount | $ 46,174 | $ 48,058 | $ 51,827

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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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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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