Quarterly report pursuant to Section 13 or 15(d)

Excess Lease Liability - Summary of Excess Lease Facility Liability (Detail)

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Excess Lease Liability - Summary of Excess Lease Facility Liability (Detail) (Excess Lease Facility [Member], USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Excess Lease Facility [Member]
 
Restructuring Cost and Reserve [Line Items]  
Current portion of excess lease facility, Liability, Beginning Balance $ 1,050
Long-term portion of excess lease facility, Liability, Beginning Balance 3,536
Liability, Total, Beginning Balance 4,586
Current portion of excess lease facility, Amortization of excess lease facility 23
Long-term portion of excess lease facility, Amortization of excess lease facility (527)
Amortization of excess lease facility (504)
Current portion of excess lease facility, Additional liability recorded   
Long-term portion of excess lease facility, Additional liability recorded   
Additional liability recorded, Total   
Current portion of excess lease facility, Liability, Ending Balance 1,073
Long-term portion of excess lease facility, Liability, Ending Balance 3,009
Liability, Total, Ending Balance $ 4,082