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Property, Equipment and Software - Summary of Property, Equipment and Software (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Property, Plant and Equipment [Line Items]                
Property, Plant and Equipment $ 39,390       $ 37,327      
Less accumulated depreciation and amortization (18,060)       (16,142)      
Property, Plant and Equipment, Gross 21,330       21,185      
Land 1,490       1,490      
Property, Plant and Equipment, Net 22,820 $ 22,465 $ 22,648 $ 22,648 22,675 [1] $ 22,576 $ 21,786 $ 21,779
Buildings [Member]                
Property, Plant and Equipment [Line Items]                
Property, Plant and Equipment 13,988       13,004      
Office Furniture and Fixtures [Member]                
Property, Plant and Equipment [Line Items]                
Property, Plant and Equipment 7,808       6,706      
Computer Hardware and Software [Member]                
Property, Plant and Equipment [Line Items]                
Property, Plant and Equipment 12,887       12,949      
Aircraft [Member]                
Property, Plant and Equipment [Line Items]                
Property, Plant and Equipment $ 4,707       $ 4,668      
[1] See Note 2. Restatement of Previously Issued Consolidated Financial Statements