Changes In Accrual For Unrecognized Income Tax Benefits And Related Interest And Penalties (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Reconciliation Of Unrecognized Tax Benefits [Line Items]
Balance, beginning of the period	$ 0	$ 0	$ 0
Amounts assumed at acquisitions	0	0	0
Additions based on tax positions related to the current year	0	0	0
Additions of tax positions of prior years	2,093	0	0
Reductions of tax positions of current year	0	0	0
Reductions of tax positions of prior year	0	0	0
Lapse of statute of limitations	0	0	0
Foreign currency translation adjustment	0	0	0
Balance, end of period	2,093	0	0
Balance, beginning of the period	3,000	0	0
Amounts assumed at acquisitions	0	0	0
Additions based on tax positions related to the current year	0	0	0
Additions of tax positions of prior years	5,044	3,000	0
Reductions of tax positions of current year	0	0	0
Reductions of tax positions of prior year	3,000	0	0
Lapse of statute of limitations	0	0	0
Foreign currency translation adjustment	0	0	0
Balance, end of period	$ 5,044	$ 3,000	$ 0