Components Of Net Deferred Tax Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule of Deferred Tax Assets and Liabilities [Line Items]
Valuation allowance	$ 0	$ 0
Carry forward losses of subsidiaries	22	147
Minimum alternate tax credit of subsidiaries	16,831	15,796
Property, plant and equipment	1,205	1,589
Accrued expenses and allowances	9,624	7,053
Total deferred tax assets	27,682	24,585
Provision for branch tax on dividend equivalent in India	(1,726)	(1,726)
Provision for tax on unrealized gains in India	(258)	(77)
Total deferred tax liabilities	(1,984)	(1,803)
Net deferred tax assets	$ 25,698	$ 22,782