Condensed Consolidating Statement of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Parent Company	Jun. 30, 2012 Parent Company	Jun. 30, 2013 Guarantor Subsidiaries	Jun. 30, 2012 Guarantor Subsidiaries	Jun. 30, 2013 Non-Guarantor Subsidiaries	Jun. 30, 2012 Non-Guarantor Subsidiaries	Jun. 30, 2013 Consolidating Adjustments	Jun. 30, 2012 Consolidating Adjustments
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities	$ 83,419	$ 69,803	$ 14,400	$ 113,898	$ 72,957	$ (34,935)	$ (3,938)	$ (9,160)	$ 0	$ 0
Cash flows from investing activities:
Additions to property, plant and equipment	(10,408)	(11,770)	(1,122)	(3,419)	(9,034)	(8,164)	(252)	(187)	0	0
Proceeds from sale of property, plant and equipment	5,188	217	79		5,100		9		0
Digital acquisitions, net of cash acquired	0	(18,362)		0		18,362		0		0
Proceeds from sale of available-for-sale securities		217		211		0		6		0
Net cash provided by (used in) investing activities	(5,220)	(29,915)	(1,043)	(3,208)	(3,934)	(26,526)	(243)	(181)	0	0
Cash flows from financing activities:
Cash provided by (used in) intercompany activity	0	0	65,671	(58,297)	(65,671)	58,297	0	0	0	0
Repayments of long-term debt	(22,557)	(7,500)	(22,557)	(7,500)	0	0	0	0	0	0
Dividends paid on common shares and restricted stock	(24,035)	0	24,035		0		0		0
Repurchases of common stock	(53,412)	(65,900)	(53,412)	(65,900)	0	0	0	0	0	0
Proceeds from issuance of common stock	16,514	6,305	16,514	6,305	0	0	0	0	0	0
Net cash provided (used in) by financing activities	(83,490)	(67,095)	(17,819)	(125,392)	(65,671)	58,297	0	0	0	0
Effect of exchange rate changes on cash and cash equivalents	(775)	473	0	0	0	0	(775)	473	0	0
Net increase (decrease) in cash and cash equivalents	(6,066)	(26,734)	(4,462)	(14,702)	3,352	(3,164)	(4,956)	(8,868)	0	0
Cash and cash equivalents at beginning of period	94,711	101,971	62,836	68,887	10,745	7,543	21,130	25,541	0	0
Cash and cash equivalents at end of period	$ 88,645	$ 75,237	$ 58,374		$ 14,097		$ 16,174		$ 0