Reconciliation of Adjusted Segment Earnings before Interest, Taxes, Depreciation and Amortization (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Total Adjusted Segment EBITDA									$ 291,375	$ 313,260	$ 316,165
Segment depreciation expense									(30,267)	(28,203)	(25,058)
Amortization of intangible assets									(15,521)	(22,954)	(22,407)
Special charges									(16,339)	(38,414)	(29,557)
Goodwill impairment charge						(83,752)				(83,752)	(110,387)
Unallocated corporate expenses, excluding special charges									(84,545)	(72,053)	(74,947)
Interest income and other									4,670	1,748	5,659
Interest expense	(12,488)	(12,634)	(12,908)	(12,655)	(12,776)	(12,814)	(13,071)	(12,715)	(50,685)	(51,376)	(56,731)
Loss on early extinguishment of debt											(4,850)
Remeasurement of acquisition-related contingent consideration									2,723	13,555	5,227
Income (loss) before income tax provision	$ 10,623	$ 34,851	$ 27,472	$ 28,465	$ (1,280)	$ (47,261)	$ 46,801	$ 33,551	$ 101,411	$ 31,811	$ 3,114