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Condensed Consolidated Financial Statements - Receivables and Concentration of Credit Risk (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Billed Receivables	$ 177,730	$ 200,392
Allowance for doubtful accounts	(5,058)	(4,806)
Billed, net	172,672	195,586
Accrued Receivables	48,297	31,520
Receivables, net	$ 220,969	$ 227,106

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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.

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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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