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 |