Acquisitions, Goodwill, and Acquired Intangible Assets - Acquired Intangible Assets (Parenthetical) (Detail)	1 Months Ended
Dec. 31, 2013
Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life	1 year
Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life	10 years

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

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