Distributions declared to non-controlling unitholders.

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

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- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

+ Details

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- Definition

Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

+ References

+ Details

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Period Type:	duration

- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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Earnings Per Share - Additional Information (Detail) (USD $)	3 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Apr. 18, 2014	May 07, 2015	Apr. 08, 2015
Dividends Payable [Line Items]
Dividends to Class A common stockholders	$ 19,383,000us-gaap_DividendsCommonStockCash
Cash dividends declared per share of Class A common stock	$ 1.6250	$ 0.0625
Common Class A
Dividends Payable [Line Items]
Dividends to Class A common stockholders	1,500,000	725,000
Cash dividends declared per share of Class A common stock	$ 0.125	$ 0.0625
Distributions declared to non-controlling unitholders	2,217,000
Dividends paid date			Apr. 18, 2014
Special Dividend Declared \| Common Class A
Dividends Payable [Line Items]
Dividends to Class A common stockholders	17,883,000
Cash dividends declared per share of Class A common stock	$ 1.50
Distributions declared to non-controlling unitholders	26,602,000
Subsequent Event
Dividends Payable [Line Items]
Distributions declared to non-controlling unitholders				$ 2,217,000
Subsequent Event \| Common Class A
Dividends Payable [Line Items]
Cash dividends declared per share of Class A common stock				$ 0.125
Dividends paid date				Jun. 04, 2015	Apr. 08, 2015
Distributions declared per Class A common stock, record date				May 21, 2015
Subsequent Event \| Special Dividend Declared \| Common Class A
Dividends Payable [Line Items]
Dividends paid date					Apr. 08, 2015