Details Definite-lived Deferred Tax Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Line Items]
Federal net operating loss carryforwards, Deferred Tax Asset	$ 57,679	$ 48,496
State net operating loss carryforwards, Deferred Tax Asset	45,929	36,912
Foreign tax credit carryforwards, Deferred Tax Asset	22,409
Charitable contribution carryforwards, Deferred Tax Asset	9,953	9,523
Federal net operating loss carryforwards, Valuation Allowance	0
State net operating loss carryforwards, Valuation Allowance	38,837	29,757
Foreign tax credit carryforwards, Valuation Allowance	0
Charitable contribution carryforwards, Valuation Allowance	$ 0
Charitable contribution carryforwards, Expiration	2014 - 2017
Federal
Income Taxes [Line Items]
Net operating loss carryforwards, Expiration	2027 - 2032
State and Local Jurisdiction
Income Taxes [Line Items]
Net operating loss carryforwards, Expiration	2014 - 2032
Foreign Tax Authority
Income Taxes [Line Items]
Tax Credit Carryforward, Expiration Date	2018 - 2021