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Debt - Summary of Debt (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Debt	$ 750,000	$ 750,000
2013 AMH Credit Agreement
Debt Instrument [Line Items]
Debt	$ 750,000	$ 750,000
Annualized Weighted Average Interest Rate	1.36%	1.37%

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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