Segment and Geographic Information - Geographic Information Regarding Revenues (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues:
Total revenues	$ 426,605	$ 433,345	$ 1,193,167	$ 444,969	$ 2,498,086	$ 1,766,993	$ 1,464,685
United States [Member]
Revenues:
Total revenues	263,608	258,330	987,311	230,850	1,740,099	930,269	540,376
United Kingdom [Member]
Revenues:
Total revenues	88,737	95,964	111,995	115,531	412,227	470,513	496,251
Asia [Member]
Revenues:
Total revenues	36,077	41,419	48,058	47,673	173,227	196,842	221,319
France [Member]
Revenues:
Total revenues	20,015	19,627	21,988	27,593	89,223	94,682	124,293
Other Americas [Member]
Revenues:
Total revenues	7,756	8,034	10,430	10,550	36,770	40,124	44,230
Other Europe/MEA [Member]
Revenues:
Total revenues	$ 10,412	$ 9,971	$ 13,385	$ 12,772	$ 46,540	$ 34,563	$ 38,216