Annual report pursuant to Section 13 and 15(d)

Valuation Allowance of Deferred Tax Assets (Detail)

v3.8.0.1
Valuation Allowance of Deferred Tax Assets (Detail) - Valuation Allowance of Deferred Tax Assets - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning Balance $ 14,524 $ 50,636 $ 52,873
Additions 21,347 [1] 483 437
Deductions (625) (36,595) (2,674)
Ending Balance $ 35,246 $ 14,524 $ 50,636
[1] A valuation allowance was provided against certain deferred tax assets arising from carryforwards of unused foreign tax credit benefits.