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Condensed Consolidating Financial Information - Guarantor Subsidiaries - Condensed Consolidated Statements of Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Condensed Financial Statements, Captions [Line Items]    
Net loss $ (35,241) $ (16,983)
Unrealized gain (loss) on short-term investments 0 471
Currency translation adjustments 806 467
Changes in pension plan asset and benefit obligation 0 (9)
Tax effect of the above-listed adjustments 8 (185)
Total comprehensive (loss) income (34,427) (16,239)
Eliminations [Member]    
Condensed Financial Statements, Captions [Line Items]    
Net loss 1,127 (2,099)
Total comprehensive (loss) income 1,127 (2,099)
Parent Company Only (issuer) [Member] | Reportable Legal Entities [Member]    
Condensed Financial Statements, Captions [Line Items]    
Net loss (35,241) (16,983)
Unrealized gain (loss) on short-term investments 0 471
Currency translation adjustments 0  
Changes in pension plan asset and benefit obligation   (9)
Tax effect of the above-listed adjustments 0 (185)
Total comprehensive (loss) income (35,241) (16,706)
Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]    
Condensed Financial Statements, Captions [Line Items]    
Net loss (2,230) 177
Total comprehensive (loss) income (2,230) 177
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]    
Condensed Financial Statements, Captions [Line Items]    
Net loss 1,103 1,922
Currency translation adjustments 806 467
Tax effect of the above-listed adjustments 8  
Total comprehensive (loss) income $ 1,917 $ 2,389