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Liability for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve	$ (8,512)	$ 153	$ (17,171)	$ (5,969)
Commercial Lines Segment
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve	(7,300)	20	(12,900)	(5,000)
Commercial Lines Segment | General Liability
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve		5,400		5,300
Commercial Lines Segment | General Liability | Accident Years 1999 through 2013
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve	(3,800)
Commercial Lines Segment | General Liability | Accident Years Prior to 2013
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve			(5,700)
Commercial Lines Segment | Professional | Accident Years 2007 through 2011
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve		(6,400)		(18,100)
Commercial Lines Segment | Professional | Accident Years 2006 through 2012
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve	(3,500)		(6,400)
Commercial Lines Segment | Property Lines | Accident Years 2011 Through 2013
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve		500
Commercial Lines Segment | Property Lines | Accident Years 2007, 2012 and 2013
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve				700
Commercial Lines Segment | Property Lines | Accident Years 2011 through 2014
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve			(800)
Commercial Lines Segment | Asbestos | Accident Years Prior to 1990
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve		200		7,100
Commercial Lines Segment | Other Lines | Accident Years 2011 Through 2013
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve		300
Commercial Lines Segment | Umbrella Lines | Accident Years 2003 through 2005
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve			(300)
Reinsurance Operations
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve	(1,200)	100	(4,300)	(1,000)
Reinsurance Operations | Accident Years 2009 to 2014
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve			$ (4,300)
Reinsurance Operations | Property Lines | Accident Year 2013
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve		(3,400)
Reinsurance Operations | Property Lines | Accident Years 2012 and 2013
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve				(4,700)
Reinsurance Operations | Property Lines | Accident Years 2009 to 2013
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve	$ (1,200)
Reinsurance Operations | Marine | Accident Years 2011 and 2012
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve		3,000		3,000
Reinsurance Operations | Commercial Auto Liability | Accident Years 2009 and 2010
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Changes in prior year reserve		$ 500		$ 700

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+ References

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Amount of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 944



-SubTopic 235



-Section S99



-Paragraph 3



-Subparagraph (SX 210.12-18)



-URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915

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