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Acquisition - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended			1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 28, 2013
Business Acquisition [Line Items]
Aggregate business acquisition purchase price		$ 37,827
Revenue	262,774us-gaap_Revenues	238,733us-gaap_Revenues	190,840us-gaap_Revenues
Net loss	(74,806)us-gaap_NetIncomeLoss	(76,016)us-gaap_NetIncomeLoss	(60,069)us-gaap_NetIncomeLoss
Xtrakter Limited [Member]
Business Acquisition [Line Items]
Aggregate business acquisition purchase price				37,827
Revenue		18,400
Net loss		$ 900

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.