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Long-Term Debt - Summary of Interest Received and Paid under Term of Cash Flow Swap (Parenthetical) (Detail) | 9 Months Ended
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Sep. 30, 2015
Derivatives, Fair Value [Line Items] |
One-month LIBOR rate | 0.193%
Receive Rate | one-month LIBOR
Cash Flow Swap 7 [Member] |
Derivatives, Fair Value [Line Items] |
Receive Rate | one-month LIBOR
Swap agreement effective date | Jul. 01, 2016
Cash Flow Swap 9 [Member] |
Derivatives, Fair Value [Line Items] |
Receive Rate | one-month LIBOR
Swap agreement effective date | Jul. 01, 2016
Cash Flow Swap 11 [Member] |
Derivatives, Fair Value [Line Items] |
Receive Rate | one-month LIBOR
Swap agreement effective date | Jul. 01, 2016
Cash Flow Swap 8 [Member] |
Derivatives, Fair Value [Line Items] |
Receive Rate | one-month LIBOR
Swap agreement effective date | Jul. 03, 2017
Cash Flow Swap 12 [Member] |
Derivatives, Fair Value [Line Items] |
Receive Rate | one-month LIBOR
Swap agreement effective date | Jul. 01, 2017
Cash Flow Swap 13 [Member] |
Derivatives, Fair Value [Line Items] |
Receive Rate | one-month LIBOR
Swap agreement effective date | Jul. 02, 2018
Cash Flow Swap 14 [Member] |
Derivatives, Fair Value [Line Items] |
Receive Rate | one-month LIBOR
Swap agreement effective date | Jul. 02, 2018

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