Condensed Consolidating Statement of Cash Flows (Detail) (USD $)	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities	$ 123,198,000	$ 422,207,000
Cash flows from investing activities:
Additions to property, plant and equipment	(18,127,000)	(16,447,000)
Additions to intangible assets		(7,581,000)
Proceeds from sale of property, plant and equipment	46,000	59,000
Proceeds from sale of available-for-sale securities	1,494,000
Net cash used in investing activities	(16,587,000)	(23,969,000)
Cash flows from financing activities:
Borrowings of long-term debt	610,000,000
Repayments of long-term debt	(709,919,000)	(303,079,000)
Debt issuance costs	(11,580,000)
Repurchases of common stock	(155,817,000)	(58,225,000)
Proceeds from issuance of common stock	5,646,000	41,603,000
Net cash provided (used in) by financing activities	(261,670,000)	(319,701,000)
Effect of exchange rate changes on cash and cash equivalents	158,000	137,000
Net increase (decrease) in cash and cash equivalents	(154,901,000)	78,674,000
Cash and cash equivalents at beginning of period	245,935,000	129,846,000
Cash and cash equivalents at end of period	91,034,000	208,520,000
Parent Company
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities	246,069,000	317,477,000
Cash flows from investing activities:
Additions to property, plant and equipment	(11,101,000)	(9,352,000)
Additions to intangible assets		(7,581,000)
Proceeds from sale of property, plant and equipment	46,000	59,000
Proceeds from sale of available-for-sale securities	1,494,000
Net cash used in investing activities	(9,561,000)	(16,874,000)
Cash flows from financing activities:
Cash provided by (used in) intercompany activity	(121,522,000)	99,091,000
Borrowings of long-term debt	610,000,000
Repayments of long-term debt	(709,919,000)	(303,079,000)
Debt issuance costs	(11,580,000)
Repurchases of common stock	(155,817,000)	(58,225,000)
Proceeds from issuance of common stock	5,646,000	41,603,000
Net cash provided (used in) by financing activities	(383,192,000)	(220,610,000)
Net increase (decrease) in cash and cash equivalents	(146,684,000)	79,993,000
Cash and cash equivalents at beginning of period	211,933,000	104,477,000
Cash and cash equivalents at end of period	65,249,000	184,470,000
Guarantor Subsidiaries
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities	(120,960,000)	100,198,000
Cash flows from investing activities:
Additions to property, plant and equipment	(6,829,000)	(6,800,000)
Net cash used in investing activities	(6,829,000)	(6,800,000)
Cash flows from financing activities:
Cash provided by (used in) intercompany activity	121,522,000	(99,091,000)
Net cash provided (used in) by financing activities	121,522,000	(99,091,000)
Net increase (decrease) in cash and cash equivalents	(6,267,000)	(5,693,000)
Cash and cash equivalents at beginning of period	8,026,000	7,614,000
Cash and cash equivalents at end of period	1,759,000	1,921,000
Non-Guarantor Subsidiaries
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities	(1,911,000)	4,532,000
Cash flows from investing activities:
Additions to property, plant and equipment	(197,000)	(295,000)
Net cash used in investing activities	(197,000)	(295,000)
Cash flows from financing activities:
Effect of exchange rate changes on cash and cash equivalents	158,000	137,000
Net increase (decrease) in cash and cash equivalents	(1,950,000)	4,374,000
Cash and cash equivalents at beginning of period	25,976,000	17,755,000
Cash and cash equivalents at end of period	$ 24,026,000	$ 22,129,000