Income Taxes (Reconciliation of Unrecognized Tax Benefits) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Abstract]
Balance at the beginning of the year	$ 23,061	$ 23,061
Increases related to tax positions from prior fiscal years	4,029	0
Increases related to tax positions taken during current fiscal year	5,557	0
Expiration of statute of limitations for the assessment of taxes	0	0
Balance at the end of the year	$ 32,647	$ 23,061