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Intangible Assets (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]    
Historical Cost $ 44,861 $ 44,861
Accumulated Amortization (26,108) (24,871)
Net Balance $ 18,753 $ 19,990
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Useful Life 9 years 9 years
Historical Cost $ 41,001 $ 41,001
Accumulated Amortization (23,917) (22,778)
Net Balance 17,084 $ 18,223
Tradenames and trademarks    
Finite-Lived Intangible Assets [Line Items]    
Useful Life   10 years
Historical Cost 3,286 $ 3,286
Accumulated Amortization (1,725) (1,643)
Net Balance $ 1,561 $ 1,643
Non-compete agreements    
Finite-Lived Intangible Assets [Line Items]    
Useful Life 5 years 5 years
Historical Cost $ 574 $ 574
Accumulated Amortization (466) (450)
Net Balance $ 108 $ 124
Maximum [Member] | Non-compete agreements    
Finite-Lived Intangible Assets [Line Items]    
Useful Life 10 years