Property, Plant, and Equipment - Property, Plant, and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross	$ 105,568	$ 91,203
Less: accumulated depreciation	(57,661)	(54,067)
Property, Plant and Equipment, Net, Total	47,907	37,136
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross	3,951	3,951
Building [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross	23,815	18,371
Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross	20,985	15,711
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross	5,738	5,185
Hardware And Software [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross	31,816	29,353
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross	15,133	14,715
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross	$ 4,130	$ 3,917