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Fair Value Measurements - Carrying Value and Fair Value of Certain Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term restricted cash equivalents $ 0 $ 6,336
Trading securities 0 3,761
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 26,006 20,751
Long-term restricted cash equivalents   6,336
Trading securities   3,761
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring | Certificates of deposit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities—held-to-maturity: 688 4,452
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring | Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Credit facility repayment feature liability 2,979  
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 26,006 20,751
Long-term restricted cash equivalents   6,336
Trading securities   3,761
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 0 0
Long-term restricted cash equivalents   0
Trading securities   0
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 0 0
Long-term restricted cash equivalents   0
Trading securities   0
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring | Certificates of deposit | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities—held-to-maturity: 688 4,452
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring | Certificates of deposit | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities—held-to-maturity: 0 0
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring | Certificates of deposit | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities—held-to-maturity: 0 $ 0
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring | Debt | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Credit facility repayment feature liability 0  
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring | Debt | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Credit facility repayment feature liability 0  
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring | Debt | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Credit facility repayment feature liability $ 2,979