Condensed Consolidating Statement of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities	$ 14,374	$ 17,966
Cash flows from investing activities:
Additions to property, plant and equipment	(9,265)	(5,024)
Proceeds from sale of property, plant and equipment	79	20
Proceeds from sale of available-for-sale securities	0	1,494
Net cash used in investing activities	(9,186)	(3,510)
Cash flows from financing activities:
Cash provided by (used in) intercompany activity	0	0
Proceeds from Issuance of Debt	0	260,000
Repayments of long-term debt	(3,750)	(243,989)
Debt issuance costs	0	(4,880)
Repurchases of common stock	(1,366)	(45,530)
Proceeds from issuance of common stock	5,685	3,133
Net cash provided (used in) by financing activities	569	(31,266)
Effect of exchange rate changes on cash and cash equivalents	(529)	1,066
Net increase (decrease) in cash and cash equivalents	5,228	(15,744)
Cash and cash equivalents at beginning of period	101,971	245,935
Cash and cash equivalents at end of period	107,199	230,191
Parent Company
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities	35,072	1,048
Cash flows from investing activities:
Additions to property, plant and equipment	(2,372)	(2,703)
Proceeds from sale of property, plant and equipment	79	20
Proceeds from sale of available-for-sale securities		1,494
Net cash used in investing activities	(2,293)	(1,189)
Cash flows from financing activities:
Cash provided by (used in) intercompany activity	(24,889)	17,594
Proceeds from Issuance of Debt		260,000
Repayments of long-term debt	(3,750)	(243,989)
Debt issuance costs		(4,880)
Repurchases of common stock	(1,366)	(45,530)
Proceeds from issuance of common stock	5,685	3,133
Net cash provided (used in) by financing activities	(24,320)	(13,672)
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	8,459	(13,813)
Cash and cash equivalents at beginning of period	68,887	211,933
Cash and cash equivalents at end of period	77,346	198,120
Guarantor Subsidiaries
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities	(19,760)	16,834
Cash flows from investing activities:
Additions to property, plant and equipment	(6,736)	(2,285)
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	(6,736)	(2,285)
Cash flows from financing activities:
Cash provided by (used in) intercompany activity	24,889	(17,594)
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	24,889	(17,594)
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	(1,607)	(3,045)
Cash and cash equivalents at beginning of period	7,543	8,026
Cash and cash equivalents at end of period	5,936	4,981
Non-Guarantor Subsidiaries
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities	(938)	84
Cash flows from investing activities:
Additions to property, plant and equipment	(157)	(36)
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	(157)	(36)
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	(529)	1,066
Net increase (decrease) in cash and cash equivalents	(1,624)	1,114
Cash and cash equivalents at beginning of period	25,541	25,976
Cash and cash equivalents at end of period	23,917	27,090
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