Quarterly report pursuant to sections 13 or 15(d)

Intangible Assets - Summary of Intangible Assets (Detail)

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Intangible Assets - Summary of Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Finite Lived Intangible Assets [Line Items]      
Cost, beginning balance $ 19,223 $ 17,476 $ 17,476
Cost, ending balance 19,223   19,223
Accumulated amortization, beginning balance (6,634) (5,113) (5,113)
Amortization expense (360) (351) (1,521)
Accumulated amortization, ending balance (6,994)   (6,634)
Net book value 12,229   12,589
Acquisition of certain assets of Ten-Sixty     1,747
Minimum
      
Finite Lived Intangible Assets [Line Items]      
Useful lives 3 years    
Maximum
      
Finite Lived Intangible Assets [Line Items]      
Useful lives   20 years  
Customer Relationships
      
Finite Lived Intangible Assets [Line Items]      
Cost, beginning balance 17,560 15,910 15,910
Cost, ending balance 17,560   17,560
Accumulated amortization, beginning balance (5,410) (4,238) (4,238)
Amortization expense (326)   (1,172)
Accumulated amortization, ending balance (5,736)   (5,410)
Net book value 11,824   12,150
Acquisition of certain assets of Ten-Sixty     1,650
Customer Relationships | Minimum
      
Finite Lived Intangible Assets [Line Items]      
Useful lives 10 years   10 years
Customer Relationships | Maximum
      
Finite Lived Intangible Assets [Line Items]      
Useful lives 20 years   20 years
Other Intangible Assets
      
Finite Lived Intangible Assets [Line Items]      
Cost, beginning balance 1,663 1,566 1,566
Cost, ending balance 1,663   1,663
Accumulated amortization, beginning balance (1,224) (875) (875)
Amortization expense (34)   (349)
Accumulated amortization, ending balance (1,258)   (1,224)
Net book value 405   439
Acquisition of certain assets of Ten-Sixty     $ 97
Other Intangible Assets | Minimum
      
Finite Lived Intangible Assets [Line Items]      
Useful lives 3 years   3 years
Other Intangible Assets | Maximum
      
Finite Lived Intangible Assets [Line Items]      
Useful lives 5 years   5 years