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Segment Information - Accounts Receivable for Services (Detail) (NPL services [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
NPL services [Member]
Segment Reporting Information [Line Items]
Accounts receivable for NPL services	$ 10,787	$ 8,179

The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle).

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