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Reconciliation for Significant Differences in Tax at Statutory and Effective Rates (Detail)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
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 (3.60%) 1.00%  
Effect of differences in U.S. and foreign statutory rates (53.70%) (9.40%) (14.10%)
Uncertain tax positions 3.40% 0.30%  
Earn-out adjustments   (7.40%)  
Provision to return 4.50% 12.20%  
Non-deductible expenses 8.90% 1.10% 1.10%
Other 0.60% 0.50% (1.50%)
Foreign deemed dividend 262.20% 1.70%  
Foreign tax credit (126.10%) (0.50%)  
Undistributed foreign earnings 906.50%    
Valuation allowance (960.90%) (21.60%) (5.80%)
Effective income tax rate 76.80% 12.90% 14.70%