Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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

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Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Goodwill and Intangibles - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2014
Goodwill And Intangible Assets [Line Items]
Amortization expense for amortized intangible assets	$ 193us-gaap_AmortizationOfIntangibleAssets	$ 8us-gaap_AmortizationOfIntangibleAssets	$ 632us-gaap_AmortizationOfIntangibleAssets	$ 23us-gaap_AmortizationOfIntangibleAssets
Subsequent Event [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill impairment charge					$ 2,000