Property and Equipment - Additional Information (Detail) (USD $)	9 Months Ended			3 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Building Improvements [Member]	Sep. 30, 2014 Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Unamortized software costs related to software projects	$ 3,600,000
Leasehold improvements			500,000
Disposal of computer equipment				5,000,000
Accumulated depreciation	$ 5,873,000	$ 9,839,000		$ 4,900,000