Subsequent Events - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended	0 Months Ended	3 Months Ended	0 Months Ended
	Dec. 31, 2014	Feb. 11, 2015	Mar. 12, 2015	Mar. 01, 2015	Dec. 31, 2013	Dec. 31, 2012
Subsequent Event [Line Items]
Number of share authorized	3,200,000				0	1,000,000
Model Consulting, Inc [Member]
Subsequent Event [Line Items]
Effective date of acquisition	Mar. 01, 2015
Subsequent Event [Member]
Subsequent Event [Line Items]
Shares repurchased			600,000
Shares repurchased, value			$ 5
Renewal period of share repurchase		11 years
Number of share authorized		5,000,000
Expiration date of share authorization		Mar. 31, 2015
Subsequent Event [Member] | Maximum [Member]
Subsequent Event [Line Items]
Additional shares of outstanding common stock authorized		5,000,000
Subsequent Event [Member] | Model Consulting, Inc [Member]
Subsequent Event [Line Items]
Acquired entity, name				Model Consulting, Inc
Expected annual revenue				$ 4.2