Discontinued Operations - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended					9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2015	Sep. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on sale of discontinued operations, net of tax	$ 0	$ 0				$ (89)	$ 1,154
Net gains (losses) from discontinued operations	$ 0	(836)				$ 0	(836)
WhiteWave Foods
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gains (losses) from discontinued operations		$ (800)
Morningstar and other discontinued operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gains (losses) from discontinued operations							$ 300
IPO | Common Stock | WhiteWave Foods
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of shares offered					13.30%
Tax-free spin-off | Common Stock | WhiteWave Foods
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of shares offered				66.80%
Tax-free debt-for-equity exchange | Common Stock | WhiteWave Foods
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of shares offered			19.90%