Acquisitions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended		0 Months Ended	6 Months Ended
Jun. 30, 2014	Jan. 31, 2014	Oct. 31, 2014 Subsequent Event [Member]	Jun. 30, 2014 Ascolta [Member]
Business Acquisition [Line Items]
Business acquired assets and liabilities		$ 5,186
Consideration paid	$ 5,033		$ 153
Identifiable intangible assets weighted-average life				5 years

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