Condensed Consolidating Statement of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities	$ 111,194	$ 123,198
Cash flows from investing activities:
Additions to property, plant and equipment	(15,783)	(18,127)
Proceeds from sale of property, plant and equipment	256	46
Proceeds from sale of available-for-sale securities	0	1,494
Net cash used in investing activities	(33,871)	(16,587)
Cash flows from financing activities:
Cash provided by (used in) intercompany activity	0	0
Proceeds from Issuance of Debt	0	610,000
Repayments of long-term debt	(11,250)	(709,919)
Debt issuance costs	0	(11,580)
Repurchases of common stock	(87,130)	(155,817)
Proceeds from issuance of common stock	8,956	5,646
Net cash provided (used in) by financing activities	(89,424)	(261,670)
Effect of exchange rate changes on cash and cash equivalents	474	158
Net increase (decrease) in cash and cash equivalents	(11,627)	(154,901)
Cash and cash equivalents at beginning of period	101,971	245,935
Cash and cash equivalents at end of period	90,344	91,034
Parent Company
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities	153,569	246,069
Cash flows from investing activities:
Additions to property, plant and equipment	(4,472)	(11,101)
Proceeds from sale of property, plant and equipment	250	46
Proceeds from sale of available-for-sale securities		1,494
Net cash used in investing activities	(4,222)	(9,561)
Cash flows from financing activities:
Cash provided by (used in) intercompany activity	(70,042)	(121,522)
Proceeds from Issuance of Debt		610,000
Repayments of long-term debt	(11,250)	(709,919)
Debt issuance costs		(11,580)
Repurchases of common stock	(87,130)	(155,817)
Proceeds from issuance of common stock	8,956	5,646
Net cash provided (used in) by financing activities	(159,466)	(383,192)
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	(10,119)	(146,684)
Cash and cash equivalents at beginning of period	68,887	211,933
Cash and cash equivalents at end of period	58,768	65,249
Guarantor Subsidiaries
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities	(40,611)	(120,960)
Cash flows from investing activities:
Additions to property, plant and equipment	(11,100)	(6,829)
Proceeds from sale of property, plant and equipment	0	0
Proceeds from sale of available-for-sale securities		0
Net cash used in investing activities	(29,444)	(6,829)
Cash flows from financing activities:
Cash provided by (used in) intercompany activity	70,042	121,522
Proceeds from Issuance of Debt		0
Repayments of long-term debt	0	0
Debt issuance costs		0
Repurchases of common stock	0	0
Proceeds from issuance of common stock	0	0
Net cash provided (used in) by financing activities	70,042	121,522
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	(13)	(6,267)
Cash and cash equivalents at beginning of period	7,543	8,026
Cash and cash equivalents at end of period	7,530	1,759
Non-Guarantor Subsidiaries
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities	(1,764)	(1,911)
Cash flows from investing activities:
Additions to property, plant and equipment	(211)	(197)
Proceeds from sale of property, plant and equipment	6	0
Proceeds from sale of available-for-sale securities		0
Net cash used in investing activities	(205)	(197)
Cash flows from financing activities:
Cash provided by (used in) intercompany activity	0	0
Proceeds from Issuance of Debt		0
Repayments of long-term debt	0	0
Debt issuance costs		0
Repurchases of common stock	0	0
Proceeds from issuance of common stock	0	0
Net cash provided (used in) by financing activities	0	0
Effect of exchange rate changes on cash and cash equivalents	474	158
Net increase (decrease) in cash and cash equivalents	(1,495)	(1,950)
Cash and cash equivalents at beginning of period	25,541	25,976
Cash and cash equivalents at end of period	24,046	24,026
Consolidating Adjustments
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities	0	0
Cash flows from investing activities:
Additions to property, plant and equipment	0	0
Proceeds from sale of property, plant and equipment	0	0
Proceeds from sale of available-for-sale securities		0
Net cash used in investing activities	0	0
Cash flows from financing activities:
Cash provided by (used in) intercompany activity	0	0
Proceeds from Issuance of Debt		0
Repayments of long-term debt	0	0
Debt issuance costs		0
Repurchases of common stock	0	0
Proceeds from issuance of common stock	0	0
Net cash provided (used in) by financing activities	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	$ 0	$ 0