Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275

Name:	us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Acquisition - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended
	Oct. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Jan. 31, 2014
Business Acquisition [Line Items]
Business acquired assets and liabilities				$ 5,220
Consideration paid	$ 771		$ 4,449
Ascolta [Member]
Business Acquisition [Line Items]
Identifiable intangible assets weighted-average life		5 years