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Goodwill, Intangible Assets and In-Process Revenue Contracts - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 348,563 | $ 317,684
Accumulated Amortization | (236,654) | (223,018)
Net Carrying Amount | 111,909 | 94,666
Customer Contracts [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 316,684 | 316,684
Accumulated Amortization | (234,894) | (223,018)
Net Carrying Amount | 81,790 | 93,666
Customer Relationships [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 30,879 |
Accumulated Amortization | (1,260) |
Net Carrying Amount | 29,619 |
Other Intangible Assets [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,000 | 1,000
Accumulated Amortization | (500) |
Net Carrying Amount | $ 500 | $ 1,000

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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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