XML 113 R86.htm IDEA: XBRL DOCUMENT v3.3.1.900
Segment Information - Additional Information (Detail)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
Segment
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Segment Reporting Information [Line Items]                      
Number of reportable segments | Segment                 4    
Total revenues $ 404,597 $ 432,167 $ 419,447 $ 404,298 $ 393,020 $ 421,418 $ 397,764 $ 363,594 $ 1,660,509 $ 1,575,796 $ 1,363,279
London, Bermuda and Cayman Islands                      
Segment Reporting Information [Line Items]                      
Total revenues                 $ 13,400 $ 13,300 $ 12,200