Income Taxes - Components of (Benefit) Expense for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Foreign:
Current	$ 163,199	$ 120,502	$ 5,280
Deferred	17,848	91,706	68,456
Federal:
Current	12,379	232	(30,515)
Deferred	(12,660)	(779)	31,080
State:
Current	(3)	43	1
Deferred
Total income tax expense	$ 180,763	$ 211,704	$ 74,302