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Reinsurance - Additional Information (Detail) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2013
Effects of Reinsurance [Line Items]
In-force policyholder coverage for windstorm exposures		$ 120,100,000,000
Percentage of premium ceded	50.00%	45.00%
Percentage reduction of premium ceded		5.00%
Covering certain loss occurrences including hurricanes		2,700,000
Option One [Member]
Effects of Reinsurance [Line Items]
Covering certain loss occurrences including hurricanes		75,000,000
Option One [Member] | Minimum [Member]
Effects of Reinsurance [Line Items]
UPCIC obtained catastrophe covering certain loss occurrences including hurricanes excess		45.00%
Covering certain loss occurrences including hurricanes		75,000,000
Option Two [Member]
Effects of Reinsurance [Line Items]
Covering certain loss occurrences including hurricanes		105,000,000
Option Two [Member] | Minimum [Member]
Effects of Reinsurance [Line Items]
Covering certain loss occurrences including hurricanes		$ 45,000,000
Option Two [Member] | Maximum [Member]
Effects of Reinsurance [Line Items]
UPCIC obtained catastrophe covering certain loss occurrences including hurricanes excess		55.00%

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