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Goodwill, Intangible Assets and In-Process Revenue Contracts - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 340,722 | $ 348,563
Accumulated Amortization | (251,547) | (236,654)
Net Carrying Amount | 89,175 | 111,909
Customer Contracts [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 317,222 | 316,684
Accumulated Amortization | (245,705) | (234,894)
Net Carrying Amount | 71,517 | 81,790
Customer Relationships [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 22,500 | 30,879
Accumulated Amortization | (4,842) | (1,260)
Net Carrying Amount | 17,658 | 29,619
Other Intangible Assets [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,000 | 1,000
Accumulated Amortization | (1,000) | (500)
Net Carrying Amount | $ 0 | $ 500

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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=66006027&loc=d3e16323-109275 + Details
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