Regulatory and Legal Developments - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended		12 Months Ended
	Dec. 31, 2012 Plaintiff	Dec. 31, 2012	Apr. 10, 2012	Dec. 31, 2012 Van Buren Estates Llc	Mar. 05, 2012 Van Buren Estates Llc
Legal Proceedings And Contingencies [Line Items]
Damage incurred due to the extra-contractual claims against STGC and STGM based on application of Mexican law		$ 0
Oral argument scheduled at Court of Appeals		2013-02
Number Of Plaintiffs	8
Number of complaints in company/its affiliates as a defendant		78
Number of complaints dismissed during the period		7
Total liability and damages concluded in the trial					6,500,000
Cost to cure the title defect at issue in the case					400,000
Motion granted under Judgment			$ 4,200,000
Action commencement date in the Superior Court of California				2010-03-26