Segment Information - Schedule of Geographical Areas of Which Company Operates (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
Segment Reporting Information [Line Items]
Revenues	$ 297,757	$ 287,796	$ 290,356	$ 285,663	$ 276,571	$ 273,282	$ 269,195	$ 253,741	$ 1,161,572	$ 1,072,789	$ 773,364
Domestic [Member]
Segment Reporting Information [Line Items]
Revenues									741,010	752,607	673,302
Europe [Member]
Segment Reporting Information [Line Items]
Revenues									376,055	295,173	95,491
Other Geographies [Member]
Segment Reporting Information [Line Items]
Revenues									$ 44,507	$ 25,009	$ 4,571