Condensed Consolidating Statement of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities	$ 69,803	$ 91,033
Cash flows from investing activities:
Additions to property, plant and equipment	(11,770)	(11,626)
Proceeds from sale of property, plant and equipment	217	20
Proceeds from sale of available-for-sale securities	0	1,494
Net cash used in investing activities	(29,915)	(10,112)
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	(7,500)	(706,169)
Debt issuance costs	0	(11,266)
Repurchases of common stock	(65,900)	(105,856)
Proceeds from issuance of common stock	6,305	4,672
Net cash provided (used in) by financing activities	(67,095)	(208,619)
Effect of exchange rate changes on cash and cash equivalents	473	725
Net increase (decrease) in cash and cash equivalents	(26,734)	(126,973)
Cash and cash equivalents at beginning of period	101,971	245,935
Cash and cash equivalents at end of period	75,237	118,962
Parent Company
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities	113,898	134,756
Cash flows from investing activities:
Additions to property, plant and equipment	(3,419)	(7,124)
Proceeds from sale of property, plant and equipment	211	20
Proceeds from sale of available-for-sale securities		1,494
Net cash used in investing activities	(3,208)	(5,610)
Cash flows from financing activities:
Cash provided by (used in) intercompany activity	(58,297)	(47,547)
Proceeds from Issuance of Debt		610,000
Repayments of long-term debt	(7,500)	(706,169)
Debt issuance costs		(11,266)
Repurchases of common stock	(65,900)	(105,856)
Proceeds from issuance of common stock	6,305	4,672
Net cash provided (used in) by financing activities	(125,392)	(256,166)
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	(14,702)	(127,020)
Cash and cash equivalents at beginning of period	68,887	211,933
Cash and cash equivalents at end of period	54,185	84,913
Guarantor Subsidiaries
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities	(34,935)	(45,665)
Cash flows from investing activities:
Additions to property, plant and equipment	(8,164)	(4,428)
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	(26,526)	(4,428)
Cash flows from financing activities:
Cash provided by (used in) intercompany activity	58,297	47,547
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	58,297	47,547
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	(3,164)	(2,546)
Cash and cash equivalents at beginning of period	7,543	8,026
Cash and cash equivalents at end of period	4,379	5,480
Non-Guarantor Subsidiaries
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities	(9,160)	1,942
Cash flows from investing activities:
Additions to property, plant and equipment	(187)	(74)
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	(181)	(74)
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	473	725
Net increase (decrease) in cash and cash equivalents	(8,868)	2,593
Cash and cash equivalents at beginning of period	25,541	25,976
Cash and cash equivalents at end of period	16,673	28,569
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