Annual report pursuant to section 13 and 15(d)

Intangible Assets - Summary of Intangible Assets (Detail)

v2.4.0.8
Intangible Assets - Summary of Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Finite Lived Intangible Assets [Line Items]    
Cost, beginning balance $ 17,476 $ 17,476
Acquisition of certain assets of Ten-Sixty 1,747  
Cost, ending balance 19,223 17,476
Accumulated amortization, beginning balance (5,113) (3,666)
Amortization expense (1,521) (1,447)
Accumulated amortization, ending balance (6,634) (5,113)
Net book value 12,589 12,363
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 15,910 15,910
Acquisition of certain assets of Ten-Sixty 1,650  
Cost, ending balance 17,560 15,910
Accumulated amortization, beginning balance (4,238) (3,144)
Amortization expense (1,172) (1,094)
Accumulated amortization, ending balance (5,410) (4,238)
Net book value 12,150 11,672
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 1,566 1,566
Acquisition of certain assets of Ten-Sixty 97  
Cost, ending balance 1,663 1,566
Accumulated amortization, beginning balance (875) (522)
Amortization expense (349) (353)
Accumulated amortization, ending balance (1,224) (875)
Net book value $ 439 $ 691
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