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Fair Value Measurements - Schedule of Fair Value Measurements (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Interest Rate Caps [Member]
Derivative
Dec. 31, 2012
Interest Rate Caps [Member]
Derivative
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents, original maturities Less than 90 days    
Number of interest rate cap agreements   22 30
Fair value of interest rate cap agreements   $ 200 $ 200