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Income Taxes - Reconciliation of Statutory and Effective Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]      
Provision computed at statutory rate $ 57,339 $ 57,461 $ 62,905
State income tax, net of Federal tax benefit 1,191 1,353 1,432
Asset impairment charge 0 3,190 0
Tax-exempt interest income (174) (230) (334)
Acquisition related items 0 322 0
Domestic manufacturing deduction (490) (105) (212)
Research and experimental credit (970) 0 (508)
Foreign rate differential (26,798) (21,598) (13,899)
Other (496) 1,884 (8)
Provision for income taxes $ 29,602 $ 42,277 $ 49,376