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Fair Value Measurements - Estimated Fair Value of Senior Notes (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Fair Value Of Senior Notes [Line Items]
Carrying Amount	$ 744,842	$ 744,108
Fair Value	809,200	734,217
5.375% Senior Notes Due 2014 [Member]
Schedule Of Fair Value Of Senior Notes [Line Items]
Carrying Amount	249,621	249,438
Fair Value	267,208	254,667
5.375% Senior Notes Due 2015 [Member]
Schedule Of Fair Value Of Senior Notes [Line Items]
Carrying Amount	249,895	249,857
Fair Value	268,867	252,083
5.625% Senior Notes Due 2020 [Member]
Schedule Of Fair Value Of Senior Notes [Line Items]
Carrying Amount	245,326	244,813
Fair Value	$ 273,125	$ 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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