Tax Effects of Temporary Differences That Give Rise to Significant Portions of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current deferred tax assets:
Accounts receivable	$ 1,501	$ 1,613
Accrued expenses and other current liabilities	3,690	1,896
Net operating loss	41,469	45,564
Current deferred tax assets	46,660	49,073
Less: valuation allowance	(3,562)	(23,928)
Net current deferred tax assets	43,098	25,145
Noncurrent deferred tax assets:
Intangible and other assets	0	43,185
Property and equipment	0	6,207
Advertising relationships	7,037	10,689
Other liabilities	16,281	12,216
AMT tax credit	5,037	0
Net operating loss	145,056	238,176
Noncurrent deferred tax assets	173,411	310,473
Less: valuation allowance	(13,240)	(147,125)
Net noncurrent deferred tax assets	160,171	163,348
Noncurrent deferred tax liabilities:
Intangible assets	536,351	570,856
Property and equipment	47,083	54,465
Cancellation of debt income	74,396	94,257
Other	2,847	3,688
Noncurrent deferred tax liabilities	660,677	723,266
Net noncurrent deferred tax liabilities	500,506	559,918
Net deferred tax liabilities	$ 457,408	$ 534,773