Acquisitions - Summary of Intangible Assets Recorded in Connection with Acquisition (Detail) - USD ($) $ in Thousands	Apr. 01, 2014	Nov. 25, 2013
StarStone
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets as of the acquisition date, Amount	$ 23,900
Intangible assets as of the acquisition date, Amount	20,000
Intangible assets as of the acquisition date, Amount	43,900
StarStone | Syndicate capacity
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets as of the acquisition date, Amount	4,000
StarStone | U.S. insurance licenses
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets as of the acquisition date, Amount	19,900
StarStone | Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets as of the acquisition date, Amount	$ 15,000
Intangible assets as of the acquisition date, Economic Useful Life (years)	4 years
StarStone | Brand
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets as of the acquisition date, Amount	$ 5,000
Intangible assets as of the acquisition date, Economic Useful Life (years)	6 years
Atrium
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets as of the acquisition date, Amount		$ 63,000
Intangible assets as of the acquisition date, Amount		27,000
Intangible assets as of the acquisition date, Amount		90,000
Atrium | Syndicate capacity
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets as of the acquisition date, Amount		32,900
Atrium | Management contract
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets as of the acquisition date, Amount		30,100
Atrium | Distribution channel
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets as of the acquisition date, Amount		$ 20,000
Intangible assets as of the acquisition date, Economic Useful Life (years)		15 years
Atrium | Brand
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets as of the acquisition date, Amount		$ 7,000
Intangible assets as of the acquisition date, Economic Useful Life (years)		10 years