Deferred Portion of Tax Provision (Benefit) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Deferred Income Benefit Taxes [Line Items]
Amortization of franchise rights	$ 514	$ 514	$ 570
Amortization of other intangibles	1,180	1,142	961
Accrued expenses, deducted for tax when paid	(13,494)	(2,076)	4,423
Capitalized costs for books, deducted for tax	7,395	7,448	4,693
Depreciation	(7,813)	(1,709)	(951)
Federal impact of unrecognized tax benefits	478	331	(921)
Foreign tax credit carryforwards		5,719	(5,719)
Other, net	(3,253)	5,787	4,314
Deferred Portion Of Tax Expense Benefit, Total	$ (14,993)	$ 17,156	$ 7,370