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Goodwill and Intangible Assets - Additional Information (Detail) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 USD ($)	Dec. 31, 2012 CNY	Dec. 31, 2011 CNY	Dec. 31, 2010 CNY
Goodwill and Intangible Assets Disclosure [Line Items]
Amortization expense of intangible assets	$ 37,560	234,001	65,673	10,252

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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