Property Plant and Equipment Presented Net of Accumulated Depreciation (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Total gross book value	$ 271,249	$ 257,924
Less-Accumulated depreciation	(100,854)	(80,333)
Less-Accumulated depreciation of leases	(651)	(931)
Total	169,744	176,660
Land and Building
Property, Plant and Equipment [Line Items]
Total gross book value	109,752	102,615
Equipment
Property, Plant and Equipment [Line Items]
Total gross book value	112,346	111,144
Motor vehicles
Property, Plant and Equipment [Line Items]
Total gross book value	16,962	15,671
Motor vehicles under lease
Property, Plant and Equipment [Line Items]
Total gross book value	2,362	3,008
Computer hardware and software
Property, Plant and Equipment [Line Items]
Total gross book value	19,699	17,476
Other
Property, Plant and Equipment [Line Items]
Total gross book value	$ 10,128	$ 8,010