Annual report pursuant to Section 13 and 15(d)

Reconciliation of Total Amounts of Unrecognized Tax Benefits Excluding Interest and Penalties (Detail)

v3.8.0.1
Reconciliation of Total Amounts of Unrecognized Tax Benefits Excluding Interest and Penalties (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Beginning Balance $ 17,403 $ 17,133 $ 16,515
Gross increases - tax positions in prior periods 92 13 40
Gross decreases - tax positions in prior periods (12)    
Gross increases - current period tax positions 265 923 2,112
Settlements (177) (924) (871)
Foreign currency translation adjustments 695 258 (663)
Ending Balance $ 18,266 $ 17,403 $ 17,133