Quarterly report pursuant to sections 13 or 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
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 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) (361) (754) (723) (1,447)
Accumulated amortization, ending balance (5,867)   (5,867)   (5,113)
Net book value 13,356   13,356   12,363
Minimum [Member]
          
Finite-Lived Intangible Assets [Line Items]          
Useful lives     3 years    
Maximum [Member]
          
Finite-Lived Intangible Assets [Line Items]          
Useful lives     20 years    
Customer Relationships [Member]
          
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     (573)   (1,094)
Accumulated amortization, ending balance (4,811)   (4,811)   (4,238)
Net book value 12,749   12,749   11,672
Customer Relationships [Member] | Minimum [Member]
          
Finite-Lived Intangible Assets [Line Items]          
Useful lives     10 years   10 years
Customer Relationships [Member] | Maximum [Member]
          
Finite-Lived Intangible Assets [Line Items]          
Useful lives     20 years   20 years
Other Intangible Assets [Member]
          
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     (181)   (353)
Accumulated amortization, ending balance (1,056)   (1,056)   (875)
Net book value $ 607   $ 607   $ 691
Other Intangible Assets [Member] | Minimum [Member]
          
Finite-Lived Intangible Assets [Line Items]          
Useful lives     3 years   3 years
Other Intangible Assets [Member] | Maximum [Member]
          
Finite-Lived Intangible Assets [Line Items]          
Useful lives     5 years   5 years