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Investments - Breakdown of Investments with Unrealized Losses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value $ 101,600 $ 128,189
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses (1,781) (2,584)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value 5,701 3,508
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses (351) (310)
Total Fair Value 107,301 131,697
Total Unrealized Losses (2,132) (2,894)
Deferred Compensation Plan Assets [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value 294 1,243
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses (12) (53)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value 245 92
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses (30) (13)
Total Fair Value 539 1,335
Total Unrealized Losses (42) (66)
Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value 32,562 35,952
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses (166) (566)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value 2,722 3,042
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses (8) (168)
Total Fair Value 35,284 38,994
Total Unrealized Losses (174) (734)
Municipal Fixed-Rate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value 8,936 9,160
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses (37) (18)
Total Fair Value 8,936 9,160
Total Unrealized Losses (37) (18)
Asset-Backed Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value 2,986 16,857
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses (14) (44)
Total Fair Value 2,986 16,857
Total Unrealized Losses (14) (44)
Mortgage/Agency-Backed Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value 7,842 15,216
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses (81) (91)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value 1,239  
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses (10)  
Total Fair Value 9,081 15,216
Total Unrealized Losses (91) (91)
U.S. Government Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value 26,449 35,397
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses (270) (248)
Total Fair Value 26,449 35,397
Total Unrealized Losses (270) (248)
Foreign Government Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value 924  
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses (1)  
Total Fair Value 924  
Total Unrealized Losses (1)  
Marketable Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value 21,607 14,364
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses (1,200) (1,564)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value 1,495 374
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses (303) (129)
Total Fair Value 23,102 14,738
Total Unrealized Losses $ (1,503) $ (1,693)