Quarterly report pursuant to Section 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, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 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   19,223
Accumulated amortization, beginning balance     (6,634) (5,113) (5,113)
Amortization expense (360) (402) (1,079) (1,156) (1,521)
Accumulated amortization, ending balance (7,713)   (7,713)   (6,634)
Net book value 11,510   11,510   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   17,560
Accumulated amortization, beginning balance     (5,410) (4,238) (4,238)
Amortization expense     (913)   (1,172)
Accumulated amortization, ending balance (6,323)   (6,323)   (5,410)
Net book value 11,237   11,237   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   1,663
Accumulated amortization, beginning balance     (1,224) (875) (875)
Amortization expense     (166)   (349)
Accumulated amortization, ending balance (1,390)   (1,390)   (1,224)
Net book value 273   273   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