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Gross Amount of Motor Vehicles Under Capital Lease and Accumulated Depreciation (Detail) (Motor vehicles, USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Motor vehicles
Capital Leased Assets [Line Items]
Motor vehicles gross amount	$ 2,516	$ 2,362
Less: accumulated depreciation	(668)	(651)
Motor vehicles net amount	$ 1,848	$ 1,711

Property, plant, or equipment held under lease agreements classified as an asset.

The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization.