Condensed Consolidating Statement of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities	$ 105,821	$ 111,194
Cash flows from investing activities:
Additions to property, plant and equipment	(14,746)	(15,783)
Proceeds from sale of property, plant and equipment	5,288	256
Digital acquisitions, net of cash acquired	0	(18,344)
Proceeds from sale of available-for-sale securities		256
Net cash provided by (used in) investing activities	(9,458)	(33,871)
Cash flows from financing activities:
Cash provided by (used in) intercompany activity	0	0
Repayments of long-term debt	(51,161)	(11,250)
Dividends paid on common shares and restricted stock	(35,732)	0
Repurchases of common stock	(60,325)	(87,130)
Proceeds from Stock Options Exercised	31,205	8,956
Net cash provided (used in) by financing activities	(116,013)	(89,424)
Effect of exchange rate changes on cash and cash equivalents	(76)	474
Net increase (decrease) in cash and cash equivalents	(19,726)	(11,627)
Cash and cash equivalents at beginning of period	94,711	101,971
Cash and cash equivalents at end of period	74,985	90,344
Parent Company
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities	11,300	153,569
Cash flows from investing activities:
Additions to property, plant and equipment	(1,744)	(4,472)
Proceeds from sale of property, plant and equipment	79
Digital acquisitions, net of cash acquired		0
Proceeds from sale of available-for-sale securities		250
Net cash provided by (used in) investing activities	(1,665)	(4,222)
Cash flows from financing activities:
Cash provided by (used in) intercompany activity	84,567	(70,042)
Repayments of long-term debt	(51,161)	(11,250)
Dividends paid on common shares and restricted stock	35,732
Repurchases of common stock	(60,325)	(87,130)
Proceeds from Stock Options Exercised	31,205	8,956
Net cash provided (used in) by financing activities	(31,446)	(159,466)
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	(21,811)	(10,119)
Cash and cash equivalents at beginning of period	62,836	68,887
Cash and cash equivalents at end of period	41,025	58,768
Guarantor Subsidiaries
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities	95,666	(40,611)
Cash flows from investing activities:
Additions to property, plant and equipment	(12,715)	(11,100)
Proceeds from sale of property, plant and equipment	5,200
Digital acquisitions, net of cash acquired		18,344
Proceeds from sale of available-for-sale securities		0
Net cash provided by (used in) investing activities	(7,515)	(29,444)
Cash flows from financing activities:
Cash provided by (used in) intercompany activity	(84,567)	70,042
Repayments of long-term debt	0	0
Dividends paid on common shares and restricted stock	0
Repurchases of common stock	0	0
Proceeds from Stock Options Exercised	0	0
Net cash provided (used in) by financing activities	(84,567)	70,042
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	3,584	(13)
Cash and cash equivalents at beginning of period	10,745	7,543
Cash and cash equivalents at end of period	14,329	7,530
Non-Guarantor Subsidiaries
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities	(1,145)	(1,764)
Cash flows from investing activities:
Additions to property, plant and equipment	(287)	(211)
Proceeds from sale of property, plant and equipment	9
Digital acquisitions, net of cash acquired		0
Proceeds from sale of available-for-sale securities		6
Net cash provided by (used in) investing activities	(278)	(205)
Cash flows from financing activities:
Cash provided by (used in) intercompany activity	0	0
Repayments of long-term debt	0	0
Dividends paid on common shares and restricted stock	0
Repurchases of common stock	0	0
Proceeds from Stock Options Exercised	0	0
Net cash provided (used in) by financing activities	0	0
Effect of exchange rate changes on cash and cash equivalents	(76)	474
Net increase (decrease) in cash and cash equivalents	(1,499)	(1,495)
Cash and cash equivalents at beginning of period	21,130	25,541
Cash and cash equivalents at end of period	19,631	24,046
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
Digital acquisitions, net of cash acquired		0
Proceeds from sale of available-for-sale securities		0
Net cash provided by (used in) investing activities	0	0
Cash flows from financing activities:
Cash provided by (used in) intercompany activity	0	0
Repayments of long-term debt	0	0
Dividends paid on common shares and restricted stock	0
Repurchases of common stock	0	0
Proceeds from Stock Options Exercised	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