Weighted Average Amortization Period for Finite Lived Intangible Assets (Detail)	12 Months Ended
Dec. 31, 2014
Trade Names
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, weighted-average amortization periods	14 years
License
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, weighted-average amortization periods	33 years
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, weighted-average amortization periods	13 years
Other
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, weighted-average amortization periods	11 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