Condensed Consolidating Statement of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net cash provided (used in) by operating activities	$ 200,241	$ 463,326	$ 197,413
Cash flows from investing activities:
Additions to property, plant and equipment	(21,720)	(26,678)	(19,104)
Additions to intangible assets		(7,582)
Proceeds from sale of property, plant and equipment	200	99	96
Proceeds from sale of available-for-sale securities	1,494	465
Net cash used in investing activities	(20,026)	(33,696)	(19,008)
Cash flows from financing activities:
Borrowings of long-term debt	610,000		20,000
Repayments of long-term debt	(713,667)	(304,845)	(200,134)
Debt issuance costs	(11,695)		(1,335)
Repurchases of common stock	(215,071)	(58,225)
Proceeds from issuance of common stock	6,814	49,461	4,520
Net cash used in financing activities	(323,619)	(313,609)	(176,949)
Effect of exchange rate changes on cash and cash equivalents	(560)	68	1,834
Net increase (decrease) in cash and cash equivalents	(143,964)	116,089	3,290
Cash and cash equivalents at beginning of the year	245,935	129,846	126,556
Cash and cash equivalents at end of the year	101,971	245,935	129,846
Parent Company
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net cash provided (used in) by operating activities	65,619	315,019	60,031
Cash flows from investing activities:
Additions to property, plant and equipment	(12,696)	(12,282)	(7,321)
Additions to intangible assets		(7,582)
Proceeds from sale of property, plant and equipment	66	99
Proceeds from sale of available-for-sale securities	1,494	465
Net cash used in investing activities	(11,136)	(19,300)	(7,321)
Cash flows from financing activities:
Cash provided by (used in) intercompany activity	126,090	125,346	126,275
Borrowings of long-term debt	610,000		20,000
Repayments of long-term debt	(713,667)	(304,845)	(200,134)
Debt issuance costs	(11,695)		(1,335)
Repurchases of common stock	(215,071)	(58,225)
Proceeds from issuance of common stock	6,814	49,461	4,520
Net cash used in financing activities	(197,529)	(188,263)	(50,674)
Net increase (decrease) in cash and cash equivalents	(143,046)	107,456	2,036
Cash and cash equivalents at beginning of the year	211,933	104,477	102,441
Cash and cash equivalents at end of the year	68,887	211,933	104,477
Guarantor Subsidiaries
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net cash provided (used in) by operating activities	134,266	139,822	138,884
Cash flows from investing activities:
Additions to property, plant and equipment	(8,793)	(14,064)	(11,028)
Proceeds from sale of property, plant and equipment	134		96
Net cash used in investing activities	(8,659)	(14,064)	(10,932)
Cash flows from financing activities:
Cash provided by (used in) intercompany activity	(126,090)	(125,346)	(126,275)
Net cash used in financing activities	(126,090)	(125,346)	(126,275)
Net increase (decrease) in cash and cash equivalents	(483)	412	1,677
Cash and cash equivalents at beginning of the year	8,026	7,614	5,937
Cash and cash equivalents at end of the year	7,543	8,026	7,614
Non-Guarantor Subsidiaries
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net cash provided (used in) by operating activities	356	8,485	(1,502)
Cash flows from investing activities:
Additions to property, plant and equipment	(231)	(332)	(755)
Net cash used in investing activities	(231)	(332)	(755)
Cash flows from financing activities:
Effect of exchange rate changes on cash and cash equivalents	(560)	68	1,834
Net increase (decrease) in cash and cash equivalents	(435)	8,221	(423)
Cash and cash equivalents at beginning of the year	25,976	17,755	18,178
Cash and cash equivalents at end of the year	$ 25,541	$ 25,976	$ 17,755