Segments - Schedule of Revenues and Long-Lived Assets by Geographical Area (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Revenues, net	$ 376,697	$ 295,283	$ 273,502	$ 253,908	$ 255,501	$ 225,150	$ 220,869	$ 193,651	$ 1,199,390	$ 895,171	$ 707,534
Long-lived assets (excluding goodwill)	2,583,362				1,025,998				2,583,362	1,025,998	599,907
United States [Member]
Segment Reporting Information [Line Items]
Revenues, net									667,878	460,111	399,573
Long-lived assets (excluding goodwill)	1,833,311				173,354				1,833,311	173,354
United Kingdom [Member]
Segment Reporting Information [Line Items]
Revenues, net									262,613	198,762	153,305
Long-lived assets (excluding goodwill)	342,023				352,538				342,023	352,538
Brazil [Member]
Segment Reporting Information [Line Items]
Long-lived assets (excluding goodwill)	$ 227,812				$ 293,055				$ 227,812	$ 293,055