Summarize Impact of ASC 606 to Condensed Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Jul. 01, 2018	Jan. 01, 2018	Dec. 31, 2017
ASSETS
Accounts receivable, less allowance for doubtful accounts	$ 454,122		$ 272,783
Inventories, net	135,550		107,525
Deferred tax assets	73,574		84,026
LIABILITIES
Deferred revenue and customer advances	82,491		83,614
Income taxes payable	32,226		59,055
Long-term deferred revenue and customer advances	25,375		30,127
SHAREHOLDERS' EQUITY
Retained earnings	74,270		$ 272,013
ASU 2014-09
ASSETS
Accounts receivable, less allowance for doubtful accounts	359,020
Inventories, net	169,380
Deferred tax assets	70,080
LIABILITIES
Deferred revenue and customer advances	75,237	$ 76,638
Income taxes payable	23,224
Long-term deferred revenue and customer advances	15,539	20,848
SHAREHOLDERS' EQUITY
Retained earnings	35,596
ASU 2014-09 | Adjustments to Recognize Under Legacy GAAP
ASSETS
Accounts receivable, less allowance for doubtful accounts	(95,102)
Inventories, net	33,830
Deferred tax assets	(3,494)
LIABILITIES
Deferred revenue and customer advances	(7,254)	5,853
Income taxes payable	(9,002)
Long-term deferred revenue and customer advances	(9,836)	$ 4,527
SHAREHOLDERS' EQUITY
Retained earnings	$ (38,674)