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Lease Exit Liability - Changes in Lease Exit Liability (Detail) (Contract Termination [Member], USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Contract Termination [Member]
 
Restructuring Cost and Reserve [Line Items]  
Accrual beginning balance $ 9,445
Principal payments (703)
Accrual ending balance $ 8,742