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 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Finite Lived Intangible Assets [Line Items]          
Cost, beginning balance     $ 17,476 $ 17,476 $ 17,476
Acquisition of certain assets of Ten-Sixty     1,747    
Cost, ending balance 19,223   19,223   17,476
Accumulated amortization, beginning balance     (5,113) (3,666) (3,666)
Amortization expense (402) (362) (1,156) (1,085) (1,447)
Accumulated amortization, ending balance (6,269)   (6,269)   (5,113)
Net book value 12,954   12,954   12,363
Customer Relationships
          
Finite Lived Intangible Assets [Line Items]          
Cost, beginning balance     15,910 15,910 15,910
Acquisition of certain assets of Ten-Sixty     1,650    
Cost, ending balance 17,560   17,560   15,910
Accumulated amortization, beginning balance     (4,238) (3,144) (3,144)
Amortization expense     (885)   (1,094)
Accumulated amortization, ending balance (5,123)   (5,123)   (4,238)
Net book value 12,437   12,437   11,672
Other Intangible Assets
          
Finite Lived Intangible Assets [Line Items]          
Cost, beginning balance     1,566 1,566 1,566
Acquisition of certain assets of Ten-Sixty     97    
Cost, ending balance 1,663   1,663   1,566
Accumulated amortization, beginning balance     (875) (522) (522)
Amortization expense     (271)   (353)
Accumulated amortization, ending balance (1,146)   (1,146)   (875)
Net book value $ 517   $ 517   $ 691
Minimum
          
Finite Lived Intangible Assets [Line Items]          
Useful lives     3 years    
Minimum | Customer Relationships
          
Finite Lived Intangible Assets [Line Items]          
Useful lives     10 years   10 years
Minimum | Other Intangible Assets
          
Finite Lived Intangible Assets [Line Items]          
Useful lives     3 years   3 years
Maximum
          
Finite Lived Intangible Assets [Line Items]          
Useful lives     20 years    
Maximum | Customer Relationships
          
Finite Lived Intangible Assets [Line Items]          
Useful lives     20 years   20 years
Maximum | Other Intangible Assets
          
Finite Lived Intangible Assets [Line Items]          
Useful lives     5 years   5 years