The Company and its Subsidiaries - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
	Jul. 17, 2012	Dec. 31, 2012 Insurers
Schedule Of Description Of Company [Line Items]
Number of operations		1
Loss from contract termination		6,200,000
WMMRC [Member]
Schedule Of Description Of Company [Line Items]
Number of primary mortgage insurers		7
Amount paid by PMI	30,700,000
PMI [Member]
Schedule Of Description Of Company [Line Items]
Amount paid by PMI	$ 49,000,000