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Derivative Instruments and Hedging Activities - Commitment of Cross Currency Swaps (Detail) (Cross Currency Interest Rate Contract [Member])
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2013
Maturing In October 2015 [Member]
USD ($)
Dec. 31, 2013
Maturing In October 2015 [Member]
NOK
Dec. 31, 2013
Maturing In January 2016 [Member]
USD ($)
Dec. 31, 2013
Maturing In January 2016 [Member]
NOK
Dec. 31, 2013
Maturing In January 2017 [Member]
USD ($)
Dec. 31, 2013
Maturing In January 2017 [Member]
NOK
Dec. 31, 2013
Maturing In May 2017 [Member]
USD ($)
Dec. 31, 2013
Maturing In May 2017 [Member]
NOK
Dec. 31, 2013
Maturing In 2018 [Member]
USD ($)
Dec. 31, 2013
Maturing In 2018 [Member]
NOK
Dec. 31, 2013
Maturing In September 2018 [Member]
USD ($)
Dec. 31, 2013
Maturing In September 2018 [Member]
NOK
Derivative [Line Items]                          
Fair Value / Carrying Amount of R Asset / Liability $ (52,219) $ (8,550)   $ (8,185)   $ (5,503)   $ (13,247)   $ (11,744)   $ (4,990)  
Notional Amount NOK   $ 122,800 700,000 $ 89,710 500,000 $ 101,351 600,000 $ 125,000 700,000 $ 143,536 800,000 $ 150,000 900,000
Floating Rate Reference Rate   NIBOR NIBOR NIBOR NIBOR NIBOR NIBOR NIBOR NIBOR NIBOR NIBOR NIBOR NIBOR
Receivable Margin   4.75% 4.75% 4.00% 4.00% 5.75% 5.75% 5.25% 5.25% 4.75% 4.75% 4.35% 4.35%
Fixed Rate Payable   5.52% 5.52% 4.80% 4.80% 7.49% 7.49% 6.88% 6.88% 5.93% 5.93% 6.43% 6.43%
Remaining Term (years)   1 year 9 months 18 days 1 year 9 months 18 days 2 years 1 month 6 days 2 years 1 month 6 days 3 years 1 month 6 days 3 years 1 month 6 days 3 years 3 months 18 days 3 years 3 months 18 days 4 years 1 month 6 days 4 years 1 month 6 days 4 years 8 months 12 days 4 years 8 months 12 days