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Debt - Summary of Debt (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Apr. 20, 2007
Debt Instrument [Line Items]
Debt	$ 728,273	$ 737,818
Annualized Weighted Average Interest Rate	4.02%	4.93%
AMH Credit Agreement [Member]
Debt Instrument [Line Items]
Debt	728,273	728,273	1,000,000
Annualized Weighted Average Interest Rate	4.02%
CIT Secured Loan Agreements [Member]
Debt Instrument [Line Items]
Debt		$ 9,545
Annualized Weighted Average Interest Rate		3.47%

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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