Annual report pursuant to Section 13 and 15(d)

Long-Term Debt - Summary of Interest Received and Paid under Term of Cash Flow Swap (Parenthetical) (Detail)

v3.6.0.2
Long-Term Debt - Summary of Interest Received and Paid under Term of Cash Flow Swap (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2016
Derivatives, Fair Value [Line Items]  
One-month LIBOR rate 0.772%
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. 03, 2017
Cash Flow Swap 11 [Member]  
Derivatives, Fair Value [Line Items]  
Receive Rate one-month LIBOR
Swap agreement effective date Jul. 01, 2017
Cash Flow Swap 17 [Member]  
Derivatives, Fair Value [Line Items]  
Receive Rate one-month LIBOR
Swap agreement effective date Jul. 01, 2017
Cash Flow Swap 12 [Member]  
Derivatives, Fair Value [Line Items]  
Receive Rate one-month LIBOR
Swap agreement effective date Jul. 02, 2018
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 15 [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. 01, 2019
Cash Flow Swap 16 [Member]  
Derivatives, Fair Value [Line Items]  
Receive Rate one-month LIBOR
Swap agreement effective date Jul. 01, 2019