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, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Contingency [Line Items]
Balance, beginning of the period	$ 5,044	$ 3,000	$ 0
Additions based on tax positions related to the current year	5,606	0	0
Additions of tax positions of prior years	8,474	5,044	3,000
Reductions of tax positions of prior year	(1,415)	(3,000)	0
Reductions of tax positions relating to settlements with taxing authorities	(1,831)	0	0
Foreign currency translation adjustment	574	0	0
Balance, end of period	16,452	5,044	3,000
Balance, beginning of the period	2,093	0	0
Additions based on tax positions related to the current year	457	0	0
Additions of tax positions of prior years	806	2,093	0
Reductions of tax positions of prior year	(20)	0	0
Reductions of tax positions relating to settlements with taxing authorities	(977)	0	0
Foreign currency translation adjustment	117	0	0
Balance, end of period	$ 2,476	$ 2,093	$ 0