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Reconciliation for Significant Differences in Tax at Statutory and Effective Rates (Detail)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of Statutory Federal Tax Rate [Line Items]      
Federal income tax expense 35.00% 35.00% 35.00%
State income tax expense, net of federal tax effect 5.00% (3.60%) 1.00%
Effect of differences in U.S. and foreign statutory rates 1.90% (53.70%) (9.40%)
Uncertain tax positions   3.40% 0.30%
Earn-out adjustments     (7.40%)
Provision to return (0.70%) 4.50% 12.20%
Non-deductible expenses (48.00%) 8.90% 1.10%
Other (0.20%) 0.60% 0.50%
Foreign deemed dividend   262.20% 1.70%
Foreign tax credit 20.30% (126.10%) (0.50%)
Undistributed foreign earnings 57.30% 906.50%  
Effect of change in federal statutory rate (23.00%)    
Valuation allowance (49.60%) (960.90%) (21.60%)
Effective income tax rate (2.00%) 76.80% 12.90%