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Investments - Contractual Maturities of Corporate Bonds, Municipal Fixed-Rate Bonds, Asset-Backed Bonds, Mortgage/Agency-Backed Bonds, U.S. Government Bonds and Foreign Government Bonds (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale-securities, Fair Value/Carrying Value $ 190,723 $ 201,133
Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than one year 18,912  
One to two years 32,497  
Two to three years 11,486  
Three to five years 3,517  
Available-for-sale-securities, Fair Value/Carrying Value 66,412 57,614
Municipal Fixed-Rate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than one year 8,321  
One to two years 1,703  
Two to three years 351  
Three to five years 1,399  
Available-for-sale-securities, Fair Value/Carrying Value 11,774 26,424
Asset-Backed Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
One to two years 635  
Two to three years 2,415  
Three to five years 5,402  
Five to ten years 1,600  
More than ten years 154  
Available-for-sale-securities, Fair Value/Carrying Value 10,206 19,239
Mortgage/Agency-Backed Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
One to two years 976  
Two to three years 980  
Five to ten years 2,060  
More than ten years 8,988  
Available-for-sale-securities, Fair Value/Carrying Value 13,004 15,373
U.S. Government Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than one year 1,701  
One to two years 4,903  
Two to three years 13,072  
Three to five years 10,091  
Available-for-sale-securities, Fair Value/Carrying Value 29,767 $ 35,398
Foreign Government Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than one year 2,400  
One to two years 1,330  
Available-for-sale-securities, Fair Value/Carrying Value $ 3,730