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General - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014 Business
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of complementary business acquired	2us-gaap_NumberOfBusinessesAcquired

X

- Definition

The number of businesses acquired by the entity during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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