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Goodwill and Intangible Assets (Detail) - (Table 3) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Line Items]      
2012 (remaining nine months)   $ 4,621  
2013   4,547  
2014   3,721  
2015   2,095  
2016   1,563  
Thereafter   10,870  
Total   27,417  
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) $ 3,045 4,045  
Customer Lists [Member]      
Goodwill [Line Items]      
Cost basis   47,019 $ 41,509
Accumulated amortization   24,127 21,341
Net carrying amount   22,892 20,168
Licensing Agreements [Member]      
Goodwill [Line Items]      
Cost basis   5,600 5,600
Accumulated amortization   5,600 5,600
Net carrying amount   0 0
Noncompete Agreements [Member]      
Goodwill [Line Items]      
Cost basis   2,440 2,440
Accumulated amortization   2,375 2,426
Net carrying amount   65 14
Contractual Rights [Member]      
Goodwill [Line Items]      
Cost basis   4,200 4,200
Accumulated amortization   4,200 4,200
Net carrying amount   0 0
Other Intangible Assets [Member]      
Goodwill [Line Items]      
Cost basis   14 14
Accumulated amortization   14 14
Net carrying amount   0 0
Total [Member]      
Goodwill [Line Items]      
Cost basis   68,493 58,353
Accumulated amortization   41,076 36,916
Net carrying amount   27,417 21,437
Trademarks [Member]      
Goodwill [Line Items]      
Cost basis   100,333 100,333
Accumulated amortization   0 0
Net carrying amount   $ 96,288 $ 97,288