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Acquisitions and Revaluations of Non-Controlling Interests - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 Partnership	Sep. 16, 2013	Jun. 01, 2013	Feb. 01, 2013
Business Acquisition [Line Items]
Number of separate transactions to purchase partnership interest	3
Number of partnership in which interest acquired	2
Purchase price for additional non controlling interest	$ 2.8
Book value of purchase price	1.7
Consolidation less than wholly owned subsidiary parent ownership interest amount changes purchase consideration charge from undistributed earning	1.1
Future tax benefits	$ 0.4
Percentage of interest acquired		100.00%	100.00%	100.00%
Minimum
Business Acquisition [Line Items]
Percentage of interest acquired	20.50%
Maximum
Business Acquisition [Line Items]
Percentage of interest acquired	35.00%

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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- Definition

Represents the purchase by the parent of an additional equity interest in a subsidiary during the period, thereby effecting a change in total (consolidated) equity attributable to the parent. The purchase of the additional equity interest represented by this element increases the parent's controlling interest in the subsidiary.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Topic 505

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-Section S99

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-Name Accounting Standards Codification

-Topic 810

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- Definition

Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

-URI http://asc.fasb.org/extlink&oid=6527854



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

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Business acquisition purchase price allocation net book value.

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Consolidation less than wholly owned subsidiary parent ownership interest amount changes purchase consideration charge from undistributed earning.

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Number of partnership in which interest acquired.

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Number of separate transactions to purchase partnership interest.

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