Segment Reporting - Revenue by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue by geographic area
Total revenue	$ 39,370	$ 59,952	$ 22,661	$ 108,801	$ 19,551	$ 132,871	$ 28,513	$ 19,771	$ 230,784	$ 200,707	$ 148,921
United States [Member]
Revenue by geographic area
Total revenue									40,400	32,514	42,535
European [Member]
Revenue by geographic area
Total revenue									$ 190,384	$ 168,193	$ 106,386