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Goodwill and Intangible Assets (Detail) - (Table 3) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Mar. 31, 2015
Dec. 31, 2018
Dec. 31, 2017
Goodwill [Line Items]        
2012 (remaining nine months)     $ 4,329  
2013     3,543  
2014     1,994  
2015     1,487  
2016     1,487  
Thereafter     8,768  
Total     21,608  
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) $ 1 $ 3 4,045 $ 4,045
Customer Lists [Member]        
Goodwill [Line Items]        
Cost basis 47,019   47,019 47,019
Accumulated amortization 24,127   28,049 24,127
Net carrying amount 22,892   18,970 22,892
Licensing Agreements [Member]        
Goodwill [Line Items]        
Cost basis 5,600   5,600 5,600
Accumulated amortization 5,600   5,600 5,600
Net carrying amount 0   0 0
Noncompete Agreements [Member]        
Goodwill [Line Items]        
Cost basis 2,440   2,440 2,440
Accumulated amortization 2,375   2,440 2,375
Net carrying amount 65   0 65
Contractual Rights [Member]        
Goodwill [Line Items]        
Cost basis 4,200   4,200 4,200
Accumulated amortization 4,200   4,200 4,200
Net carrying amount 0   0 0
Other Intangible Assets [Member]        
Goodwill [Line Items]        
Cost basis 14   14 14
Accumulated amortization 14   14 14
Net carrying amount 0   0 0
Total [Member]        
Goodwill [Line Items]        
Cost basis 68,493   68,493 68,493
Accumulated amortization 41,076   46,885 41,076
Net carrying amount 27,417   21,608 27,417
Trademarks [Member]        
Goodwill [Line Items]        
Cost basis 100,333   100,333 100,333
Accumulated amortization 0   0 0
Net carrying amount $ 96,288   $ 96,288 $ 96,288