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Derivative Financial Instruments - Impact on Interest Expense of Interest Rate Agreements Accounted for as Cash Flow Hedges (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative [Line Items]                      
Total interest expense $ (25,039) $ (23,875) $ (23,008) $ (23,961) $ (23,903) $ (23,350) $ (21,151) $ (19,059) $ (95,883) $ (87,463) $ (80,971)
Cash Flow Hedging | Interest Rate Contract                      
Derivative [Line Items]                      
Net interest expense on cash interest rate agreements                 (5,883) (5,951) (5,889)
Realized expense due to ineffective portion of cash flow hedges                 0 0 0
Realized net losses reclassified from other comprehensive income                 (95) (164) (281)
Total interest expense                 $ (5,978) $ (6,115) $ (6,170)