Condensed Combined Debtors' Financial Information (Balance Sheet)(Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 120,122	$ 102,891
Restricted cash	9,004	8,999
Accounts receivable, less allowance for doubtful accounts of $4,322	212,010	235,247
Trade receivable	5,612	4,224
Prepaid expenses and other current assets	51,720	42,259
Total current assets	398,468	393,620
Property and equipment, net	193,322	191,604
Other intangible assets, net	78,289	82,994
Goodwill	135,214	135,214
Other assets	20,772	20,078
Total assets	2,029,874	2,027,319
Current liabilities:
Accounts payable and accrued expenses	86,661	36,157
Total current liabilities not subject to compromise	86,661	36,157
Other liabilities	179	54
Total liabilities not subject to compromise	86,840	36,211
Liabilities subject to compromise	2,643,984	2,687,223
Total liabilities	2,730,824	2,723,434
Stockholders’ deficit:
Treasury stock, at cost	(229,310)	(229,310)
Additional paid-in-capital	1,626,594	1,626,428
Accumulated deficit	(2,098,555)	(2,093,554)
Total stockholders’ deficit	(700,950)	(696,115)
Total liabilities and stockholders’ deficit	2,029,874	2,027,319
Class A common stock
Stockholders’ deficit:
Common stock	320	320
Class C common stock
Stockholders’ deficit:
Common stock	1	$ 1
Unconsolidated Subsidiaries
Current assets:
Cash and cash equivalents	120,122
Restricted cash	9,004
Accounts receivable, less allowance for doubtful accounts of $4,322	212,010
Trade receivable	5,612
Prepaid expenses and other current assets	51,720
Total current assets	398,468
Property and equipment, net	193,322
Other intangible assets, net	78,289
Goodwill	135,214
Investment in non-filing entities	1,203,809
Other assets	20,772
Total assets	2,029,874
Current liabilities:
Accounts payable and accrued expenses	86,661
Total current liabilities not subject to compromise	86,661
Other liabilities	179
Total liabilities not subject to compromise	86,840
Liabilities subject to compromise	2,643,984
Total liabilities	2,730,824
Stockholders’ deficit:
Treasury stock, at cost	(229,310)
Additional paid-in-capital	1,626,594
Accumulated deficit	(2,098,555)
Total stockholders’ deficit	(700,950)
Total liabilities and stockholders’ deficit	2,029,874
Unconsolidated Subsidiaries | Class A common stock
Stockholders’ deficit:
Common stock	320
Unconsolidated Subsidiaries | Class C common stock
Stockholders’ deficit:
Common stock	$ 1