Annual report pursuant to Section 13 and 15(d)

Valuation Allowance of Deferred Tax Assets (Detail)

v3.10.0.1
Valuation Allowance of Deferred Tax Assets (Detail) - Valuation Allowance of Deferred Tax Assets - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning Balance $ 35,246 $ 14,524 $ 50,636
Additions 22,005 [1] 21,347 483
Deductions (2,526) (625) (36,595)
Ending Balance $ 54,725 $ 35,246 $ 14,524
[1] A valuation allowance was provided against certain deferred tax assets arising from carryforwards of unused foreign tax credit benefits.