Accounting Policies (Cumulative Effect of the Changes Made to the Balance Sheet for the Adoption of the New Revenue Standard) (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
ASSETS
Accounts receivable	$ 265,012	$ 234,597
Inventories	176,487	164,318
Property and equipment, net	394,021	379,096
TOTAL ASSETS	1,520,685	1,713,416
LIABILITIES AND STOCKHOLDERS’ DEFICIT
Accounts payable	68,015	66,968
Accrued liabilities	228,380	253,418
Deferred income tax liabilities	35,459	25,353
Other long-term liabilities	83,267	95,718
Total liabilities	1,561,534	1,767,258
Stockholders’ Deficit:
Retained earnings	989,039	803,545
Total stockholders’ deficit	(40,849)	(53,842)
TOTAL LIABILITIES AND STOCKHOLDERS’ DEFICIT	1,520,685	1,713,416
Accounting Standards Update 2014-09
ASSETS
Cash, cash equivalents and marketable securities		471,930
Accounts receivable	265,012	237,281
Inventories	176,487	163,184
Property and equipment, net	394,021	379,096
Goodwill and intangible assets, net	235,010	243,719
Other assets	275,596	246,481
TOTAL ASSETS	1,520,685	1,741,691
LIABILITIES AND STOCKHOLDERS’ DEFICIT
Accounts payable	68,015	66,968
Accrued liabilities	228,380	254,381
Deferred income tax liabilities	35,459	25,087
Line of credit and long-term debt	1,040,130	1,261,075
Deferred revenue	106,283	110,158
Other long-term liabilities	83,267	82,840
Total liabilities	1,561,534	1,800,509
Stockholders’ Deficit:
Retained earnings	989,039	798,569
All other stockholders' deficit and noncontrolling interest	(987,329)	(857,387)
Total stockholders’ deficit	(40,849)	(58,818)
TOTAL LIABILITIES AND STOCKHOLDERS’ DEFICIT	1,520,685	1,741,691
Accounting Standards Update 2014-09 | Previous U.S. GAAP (Reported)
ASSETS
Cash, cash equivalents and marketable securities		471,930
Accounts receivable	262,420	234,597
Inventories	178,187	164,318
Property and equipment, net	394,021	379,096
Goodwill and intangible assets, net	235,010	243,719
Other assets	238,682	219,756
TOTAL ASSETS	1,482,879	1,713,416
LIABILITIES AND STOCKHOLDERS’ DEFICIT
Accounts payable	68,015	66,968
Accrued liabilities	228,095	253,418
Deferred income tax liabilities	35,470	25,353
Line of credit and long-term debt	1,040,130	1,261,075
Deferred revenue	64,061	64,726
Other long-term liabilities	92,290	95,718
Total liabilities	1,528,061	1,767,258
Stockholders’ Deficit:
Retained earnings	984,736	803,545
All other stockholders' deficit and noncontrolling interest	(987,329)	(857,387)
Total stockholders’ deficit	(45,182)	(53,842)
TOTAL LIABILITIES AND STOCKHOLDERS’ DEFICIT	1,482,879	1,713,416
Accounting Standards Update 2014-09 | Attributed to the New Revenue Standard
ASSETS
Accounts receivable	2,592	2,684
Inventories	(1,700)	(1,134)
Property and equipment, net	0
Goodwill and intangible assets, net	0
Other assets	36,914	26,725
TOTAL ASSETS	37,806	28,275
LIABILITIES AND STOCKHOLDERS’ DEFICIT
Accounts payable	0
Accrued liabilities	285	963
Deferred income tax liabilities	(11)	(266)
Line of credit and long-term debt	0
Deferred revenue	42,222	45,432
Other long-term liabilities	(9,023)	(12,878)
Total liabilities	33,473	33,251
Stockholders’ Deficit:
Retained earnings	4,303	(4,976)
All other stockholders' deficit and noncontrolling interest	0
Total stockholders’ deficit	4,333	(4,976)
TOTAL LIABILITIES AND STOCKHOLDERS’ DEFICIT	$ 37,806	$ 28,275