Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended						3 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Acquired software licenses [Member]	Dec. 31, 2012 Acquired software licenses [Member]	Dec. 31, 2011 Acquired software licenses [Member]	Sep. 30, 2012 Intangible assets [Member]	Mar. 31, 2012 Intangible assets [Member]	Dec. 31, 2013 Intangible assets [Member]	Dec. 31, 2011 Intangible assets [Member]
Finite-Lived Intangible Assets [Line Items]
Purchased intangible assets net	$ 2,131,000	$ 3,163,000		$ 112,000	$ 248,000
Intangible assets accumulated amortization	12,983,000	11,951,000		2,200,000	2,100,000
Impairment loss	0	49,521,000	3,277,000				7,300,000	22,800,000	0	3,277,000
Deduction on impairment charges									300,000
Amortization expense	$ 562,000	$ 1,074,000	$ 2,220,000	$ 113,000	$ 196,000	$ 422,000
Weighted average remaining useful life of long-lived intangible assets	2 years 1 month 6 days