Financial Instruments - Fair Value of Financial Instruments and Other Non-Financial Assets (Parenthetical) (Detail) $ in Thousands	6 Months Ended
Jun. 30, 2015 USD ($)
Fair Value Disclosures [Abstract]
Estimated fair value of receivable	$ 17,321
Discount rate	8.00%

Fair value portion of receivables, including, but not limited to, trade account receivables, note receivables, and loan receivables.

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 02

-Paragraph 3, 4

-Article 5

Name:	us-gaap_ReceivablesFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant