Copal Partners, Purchase Price Allocation (Parenthetical) (Detail) (Copal Partners)	1 Months Ended
Nov. 04, 2011
Trade names
Business Acquisition [Line Items]
Weighted average life of intangible assets acquired (in years)	15 years
Client relationships
Business Acquisition [Line Items]
Weighted average life of intangible assets acquired (in years)	16 years
Other intangibles
Business Acquisition [Line Items]
Weighted average life of intangible assets acquired (in years)	2 years
Total Intangible Assets
Business Acquisition [Line Items]
Weighted average life of intangible assets acquired (in years)	15 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=7658586&loc=d3e16265-109275

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