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Goodwill, Intangible Assets and In-Process Revenue Contracts - Summary of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted-Average Amortization Period (Years) | 13 years 7 months 6 days | 15 years 2 months 12 days
Gross Carrying Amount | $ 317,964 | $ 341,245
Accumulated Amortization | (191,828) | (204,503)
Net Carrying Amount | 126,136 | 136,742
Customer contracts [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted-Average Amortization Period (Years) | 13 years 8 months 12 days | 15 years 7 months 6 days
Gross Carrying Amount | 316,684 | 329,815
Accumulated Amortization | (191,587) | (194,266)
Net Carrying Amount | 125,097 | 135,549
Other intangible assets [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted-Average Amortization Period (Years) | 10 months 24 days | 4 years 6 months
Gross Carrying Amount | 1,280 | 11,430
Accumulated Amortization | (241) | (10,237)
Net Carrying Amount | $ 1,039 | $ 1,193

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275 + Details
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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=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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