Summarized Selected Financial Information for Discontinued Operations (Detail) (Shanghai JIDI Network Technology Co., Ltd., Variable Interest Entity, Primary Beneficiary, USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Shanghai JIDI Network Technology Co., Ltd. \| Variable Interest Entity, Primary Beneficiary
Discontinued Operations [Line Items]
Revenue	$ 100	$ 29
Loss from discontinued operations before tax	(2,521)	(4,240)
Income tax expense
Loss from discontinued operations	$ (2,521)	$ (4,240)

Summarized Selected Financial Information for Discontinued Operations (Detail) (Shanghai JIDI Network Technology Co., Ltd., Variable Interest Entity, Primary Beneficiary, USD $)
In Thousands, unless otherwise specified

12 Months Ended

Dec. 31, 2012

Dec. 31, 2011

Shanghai JIDI Network Technology Co., Ltd. | Variable Interest Entity, Primary Beneficiary

Discontinued Operations [Line Items]

Revenue

$ 100

$ 29

Loss from discontinued operations before tax

(2,521)

(4,240)

Income tax expense

Loss from discontinued operations

$ (2,521)

$ (4,240)

- Definition

Pretax income (loss) from operations of a business component (exclusive of any gain (loss) on disposal, or provision therefore) during the reporting period, until its disposal.

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- Definition

After tax income (loss) from operations of a business component (exclusive of any gain (loss) on disposal, or provision therefore) during the reporting period, until its disposal.

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- Definition

Income tax expense or benefit attributable to Income or Loss from discontinued operations during the phase-out period.

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