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Operating Leases - Narrative (Detail) (USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Location
Jun. 30, 2013
Dec. 31, 2014
Full Year 2014
Operating Leased Assets [Line Items]      
Operating expenses   9.80 10.12
Operating Leases, Future Minimum Payments Due $ 6,619,000    
Contractual Reimbursement of Future Minimum Lease Payments Expected Over Life of Operating Lease Agreement $ 314,000    
Number of office space locations 3