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Fair Value Measurements - Estimated Fair Value of Senior Notes (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Schedule Of Fair Value Of Senior Notes [Line Items]
Carrying Amount	$ 744,654	$ 744,108
Fair Value	801,484	734,217
5.375% Senior Notes Due 2014 [Member]
Schedule Of Fair Value Of Senior Notes [Line Items]
Carrying Amount	249,574	249,438
Fair Value	263,967	254,667
5.375% Senior Notes Due 2015 [Member]
Schedule Of Fair Value Of Senior Notes [Line Items]
Carrying Amount	249,885	249,857
Fair Value	266,467	252,083
5.625% Senior Notes Due 2020 [Member]
Schedule Of Fair Value Of Senior Notes [Line Items]
Carrying Amount	245,195	244,813
Fair Value	$ 271,050	$ 227,467

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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