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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Joint Venture with China Mengniu Dairy Company - Additional Information (Detail)			3 Months Ended	6 Months Ended
	Jan. 05, 2014 CNY (¥)	Jan. 05, 2014 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 CNY (¥)	Jun. 30, 2015 USD ($)	Jan. 05, 2014 USD ($)
Schedule of Equity Method Investments [Line Items]
Cash contribution to the joint venture				$ 701,000	$ 47,285,000
Zhengzhou [Member]
Schedule of Equity Method Investments [Line Items]
Company's stake in the joint venture	49.00%					49.00%	49.00%	49.00%
Partner's stake in the joint venture	51.00%							51.00%
Purchase price	¥ 504,000,000	$ 80,900,000
Equity of joint venture	¥ 376,700,000							$ 60,300,000
Cash contribution to the joint venture				$ 0	47,300,000
Due diligence, investment advisors and regulatory matters expenses			$ 0		$ 300,000
Foreign Line of Credit [Member] \| Zhengzhou [Member]
Schedule of Equity Method Investments [Line Items]
Credit facility maximum borrowing capacity						¥ 120,000,000	$ 19,400,000
Percentage of the line of credit facility that the company has guaranteed						49.00%	49.00%
Amount of the line of credit that the company has guaranteed						¥ 58,800,000	$ 9,500,000
Amount outstanding on the line of credit						¥ 80,000,000	$ 12,900,000