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Condensed Consolidated Financial Statements - Receivables and Concentration of Credit Risk (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Accounting Policies [Abstract] |  |
Billed Receivables | $ 151,050 | $ 192,045
Allowance for doubtful accounts | (4,335) | (5,045)
Billed, net | 146,715 | 187,000
Accrued Receivables | 23,289 | 32,116
Receivables, net | $ 170,004 | $ 219,116

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- Definition Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 3 -Subparagraph a, b -Article 5 + Details
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