Goodwill and Intangible Assets - Additional Information (Detail) (CPO Commerce, Inc [Member], USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Goodwill [Line Items]
Purchase price allocated to finite lived intangible assets	$ 12,800
Customer relationships [Member]
Goodwill [Line Items]
Purchase price allocated to finite lived intangible assets	5,200
Finite lived Intangible assets, weighted-average amortization period	3 years
Trademarks [Member]
Goodwill [Line Items]
Purchase price allocated to finite lived intangible assets	$ 7,600
Finite lived Intangible assets, weighted-average amortization period	15 years