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Income Taxes - Components of Deferred Income Taxes (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred Tax Assets    
Tax credit carryforwards $ 26,271 $ 21,905
Net operating loss carryforwards 24,158 34,666
Deferred compensation 22,457 26,196
Accrued expenses 13,340 8,478
Other 936 1,699
Impaired investment interest 568 810
Total 87,730 93,754
Valuation allowance (21,106) (31,362)
Total 66,624 62,392
Deferred Tax Liabilities    
Customer relationships 220,780 351,448
Other intangible assets 53,716 38,728
Acquired technology 53,255 100,691
Unremitted foreign earnings 7,192 6,111
Trade names 6,299 10,404
Property and equipment 6,268 2,989
Deferred revenue 247 3,166
Total 347,757 513,537
Total $ 347,757 $ 513,537