Summary of Significant Accounting Policies - Components of Other Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Other Assets [Line Items]
Retirement benefit assets	$ 4,021	$ 4,374
Deferred compensation benefits	20,642	18,218
Investments	206,487	27,810
Cash surrender value of life insurance policies	78,860	70,109
Customer sales returns inventories	134,367	134,367
Other long-term prepayments and receivables	198,886	151,599
Total other assets	$ 643,263	$ 406,477