Regulatory and Legal Developments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended	12 Months Ended	0 Months Ended
	Jun. 11, 2014	Dec. 31, 2014 Plaintiff	Aug. 05, 2013 Plaintiff
Hurst Financial Loans Litigation
Loss Contingencies [Line Items]
Litigation settlement	$ 10.53
Hurst Financial Loans Litigation | Settled Litigation
Loss Contingencies [Line Items]
Number of plaintiffs	500
Percent of total plaintiffs (more than)	90.00%
Hurst Financial Loans Litigation | Pending Litigation
Loss Contingencies [Line Items]
Number of plaintiffs		2
Bellwether Trials
Loss Contingencies [Line Items]
Number of plaintiffs			8
Bellwether Jury Trial Claim Selected by Plaintiffs
Loss Contingencies [Line Items]
Bellwether jury trial claims pending			4
Bellwether Jury Trial Claim Selected by Defendants
Loss Contingencies [Line Items]
Bellwether jury trial claims pending			4
Hurst Financial Loans, Bellwether Trials, Including Stewart Title Company
Loss Contingencies [Line Items]
Number of plaintiffs			1