Condensed Consolidating Statement of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities	$ 146,039	$ 200,241	$ 463,326
Cash flows from investing activities:
Additions to property, plant and equipment	(21,194)	(21,720)	(26,678)
Payments to Acquire Intangible Assets	0	0	(7,582)
Payments to Acquire Businesses, Net of Cash Acquired	(18,653)	0	0
Proceeds from sale of property, plant and equipment	261	200	99
Proceeds from sale of available-for-sale securities	0	1,494	465
Net Cash Provided by (Used in) Investing Activities	(39,586)	(20,026)	(33,696)
Cash provided by (used in) intercompany activity	0	0	0
Proceeds from Issuance of Debt	0	610,000	0
Repayments of long-term debt	(15,000)	(713,667)	(304,845)
Debt issuance costs	0	(11,695)	0
Repurchases of common stock	(111,962)	(215,071)	(58,225)
Proceeds from issuance of common stock	11,802	6,814	49,461
Net cash provided (used in) by financing activities	(115,160)	(323,619)	(313,609)
Effect of exchange rate changes on cash and cash equivalents	1,447	(560)	68
Net increase (decrease) in cash and cash equivalents	(7,260)	(143,964)	116,089
Cash and cash equivalents at beginning of period	101,971	245,935	129,846
Cash and cash equivalents at end of period	94,711	101,971	245,935
Parent Company
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities	47,942	65,619	315,019
Cash flows from investing activities:
Additions to property, plant and equipment	(6,388)	(12,696)	(12,282)
Payments to Acquire Intangible Assets			(7,582)
Payments to Acquire Businesses, Net of Cash Acquired	0
Proceeds from sale of property, plant and equipment	250	66	99
Proceeds from sale of available-for-sale securities		1,494	465
Net Cash Provided by (Used in) Investing Activities	(6,138)	(11,136)	(19,300)
Cash provided by (used in) intercompany activity	67,305	126,090	125,346
Proceeds from Issuance of Debt		610,000
Repayments of long-term debt	(15,000)	(713,667)	(304,845)
Debt issuance costs		(11,695)
Repurchases of common stock	(111,962)	(215,071)	(58,225)
Proceeds from issuance of common stock	11,802	6,814	49,461
Net cash provided (used in) by financing activities	(47,855)	(197,529)	(188,263)
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	(6,051)	(143,046)	107,456
Cash and cash equivalents at beginning of period	68,887	211,933	104,477
Cash and cash equivalents at end of period	62,836	68,887	211,933
Guarantor Subsidiaries
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities	95,691	134,266	139,822
Cash flows from investing activities:
Additions to property, plant and equipment	(14,494)	(8,793)	(14,064)
Payments to Acquire Intangible Assets			0
Payments to Acquire Businesses, Net of Cash Acquired	(18,653)
Proceeds from sale of property, plant and equipment	5	134	0
Proceeds from sale of available-for-sale securities		0	0
Net Cash Provided by (Used in) Investing Activities	(33,142)	(8,659)	(14,064)
Cash provided by (used in) intercompany activity	(59,347)	(126,090)	(125,346)
Proceeds from Issuance of Debt		0
Repayments of long-term debt	0	0	0
Debt issuance costs		0
Repurchases of common stock	0	0	0
Proceeds from issuance of common stock	0	0	0
Net cash provided (used in) by financing activities	(59,347)	(126,090)	(125,346)
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	3,202	(483)	412
Cash and cash equivalents at beginning of period	7,543	8,026	7,614
Cash and cash equivalents at end of period	10,745	7,543	8,026
Non-Guarantor Subsidiaries
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities	2,406	356	8,485
Cash flows from investing activities:
Additions to property, plant and equipment	(312)	(231)	(332)
Payments to Acquire Intangible Assets			0
Payments to Acquire Businesses, Net of Cash Acquired	0
Proceeds from sale of property, plant and equipment	6	0	0
Proceeds from sale of available-for-sale securities		0	0
Net Cash Provided by (Used in) Investing Activities	(306)	(231)	(332)
Cash provided by (used in) intercompany activity	(7,958)	0	0
Proceeds from Issuance of Debt		0
Repayments of long-term debt	0	0	0
Debt issuance costs		0
Repurchases of common stock	0	0	0
Proceeds from issuance of common stock	0	0	0
Net cash provided (used in) by financing activities	(7,958)	0	0
Effect of exchange rate changes on cash and cash equivalents	1,447	(560)	68
Net increase (decrease) in cash and cash equivalents	(4,411)	(435)	8,221
Cash and cash equivalents at beginning of period	25,541	25,976	17,755
Cash and cash equivalents at end of period	21,130	25,541	25,976
Consolidating Adjustments
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities	0	0	0
Cash flows from investing activities:
Additions to property, plant and equipment	0	0	0
Payments to Acquire Intangible Assets			0
Payments to Acquire Businesses, Net of Cash Acquired	0
Proceeds from sale of property, plant and equipment	0	0	0
Proceeds from sale of available-for-sale securities		0	0
Net Cash Provided by (Used in) Investing Activities	0	0	0
Cash provided by (used in) intercompany activity	0	0	0
Proceeds from Issuance of Debt		0
Repayments of long-term debt	0	0	0
Debt issuance costs		0
Repurchases of common stock	0	0	0
Proceeds from issuance of common stock	0	0	0
Net cash provided (used in) by financing activities	0	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents at beginning of period	0	0	0
Cash and cash equivalents at end of period	$ 0	$ 0	$ 0