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Stockholders' Equity - Cash Dividends Declared to Stockholders (Narrative) (Detail) (USD $)
Jul. 30, 2012
Minimum [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Dividend distribution rate $ 0.125us-gaap_DividendsPayableAmountPerShare
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Dividend distribution rate $ 0.250us-gaap_DividendsPayableAmountPerShare
/ us-gaap_RangeAxis
= us-gaap_MaximumMember