This element represents disclosure of the total aggregate cash dividends paid to the entity by consolidated subsidiaries, by unconsolidated subsidiaries, and by 50% or less owned persons accounted for using the equity method.

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

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

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

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Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

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

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Dividends received on equity and other investments during the current period.

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Schedule I - Dividends from Subsidiaries - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	1 Months Ended	12 Months Ended			0 Months Ended	1 Months Ended				0 Months Ended
	Mar. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 05, 2015	Mar. 31, 2014	Jun. 30, 2014	May 31, 2014	Jun. 30, 2013	Oct. 06, 2014	Jul. 01, 2014	Apr. 01, 2014	Jan. 03, 2014	Oct. 01, 2013	Jul. 01, 2013	Mar. 30, 2012
Dividends Payable [Line Items]
Cash dividend declared		$ 0.62	$ 0.60	$ 6.07
Dividends declared	$ 500,000us-gaap_DividendsCommonStockCash	$ 54,345us-gaap_DividendsCommonStockCash	$ 53,911us-gaap_DividendsCommonStockCash	$ 500,000us-gaap_DividendsCommonStockCash
Subsequent Events [Member]
Dividends Payable [Line Items]
Dividend payable date					Jan. 22, 2015
Cash dividend declared					$ 0.21
Dividend record date					Jan. 13, 2015
Q1 2014 Declaration [Member]
Dividends Payable [Line Items]
Dividend payable date		Apr. 01, 2014
Cash dividend declared						$ 0.20
Dividend record date		Mar. 20, 2014
Q2 2014 Declaration [Member]
Dividends Payable [Line Items]
Dividend payable date		Jul. 01, 2014
Cash dividend declared							$ 0.21	$ 0.21
Dividend record date		Jun. 20, 2014
Q2 2013 Declaration [Member]
Dividends Payable [Line Items]
Dividend payable date		Jul. 01, 2013
Cash dividend declared									$ 0.20
Dividend record date		Jun. 20, 2013
Parent Company [Member]
Dividends Payable [Line Items]
Dividend declared to stockholders										18,290	18,290	17,766	17,767	18,072	18,072
Cash dividends payable		172	17,939	203
Dividends received																500,000
Dividends declared																500,000
Parent Company [Member] \| Subsequent Events [Member]
Dividends Payable [Line Items]
Dividend payable date					Jan. 22, 2015
Cash dividend declared					$ 0.21
Dividend record date					Jan. 13, 2015
Parent Company [Member] \| Subsequent Events [Member] \| Maximum [Member]
Dividends Payable [Line Items]
Cash dividends payable					$ 18,112
Parent Company [Member] \| Q1 2014 Declaration [Member]
Dividends Payable [Line Items]
Dividend payable date		Apr. 01, 2014
Cash dividend declared						$ 0.20
Dividend record date		Mar. 20, 2014
Parent Company [Member] \| Q2 2014 Declaration [Member]
Dividends Payable [Line Items]
Dividend payable date		Jul. 01, 2014
Cash dividend declared							$ 0.21
Dividend record date		Jun. 20, 2014
Parent Company [Member] \| Q2 2013 Declaration [Member]
Dividends Payable [Line Items]
Dividend payable date		Jul. 01, 2013
Cash dividend declared									$ 0.20
Dividend record date		Jun. 20, 2013