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Property and Equipment - Realized Gain (Losses) on the Disposal of Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property Plant And Equipment [Abstract]
Realized gain (loss) on disposal	$ (19)us-gaap_AssetsDisposedOfByMethodOtherThanSaleInPeriodOfDispositionGainLossOnDisposition1	$ (10)us-gaap_AssetsDisposedOfByMethodOtherThanSaleInPeriodOfDispositionGainLossOnDisposition1	$ (6)us-gaap_AssetsDisposedOfByMethodOtherThanSaleInPeriodOfDispositionGainLossOnDisposition1

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- Definition

Amount of gain (loss) from the disposal of an asset through means other than sale, for example, but not limited to, abandonment, spin-off, and expropriation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 45

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2611-110228



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 40

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6390744&loc=d3e2212-110226

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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