Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
Long-Term Debt - Summary of Interest Received and Paid under Term of Cash Flow Swap (Parenthetical) (Detail)
 9 Months Ended
Sep. 30, 2017
USD ($)
Derivatives, Fair Value [Line Items]  
One-month LIBOR rate 1.232%
Receive Rate one-month LIBOR
Cash Flow Swap 3 [Member]  
Derivatives, Fair Value [Line Items]  
Receive Rate one-month LIBOR
Swap agreement effective date Jul. 02, 2018
Cash Flow Swap 4 [Member]  
Derivatives, Fair Value [Line Items]  
Receive Rate one-month LIBOR
Swap agreement effective date Jul. 02, 2018
Cash Flow Swap 6 [Member]  
Derivatives, Fair Value [Line Items]  
Receive Rate one-month LIBOR
Swap agreement effective date Jul. 02, 2018
Cash Flow Swap 5 [Member]  
Derivatives, Fair Value [Line Items]  
Receive Rate one-month LIBOR
Swap agreement effective date Jul. 01, 2019
Cash Flow Swap 7 [Member]  
Derivatives, Fair Value [Line Items]  
Receive Rate one-month LIBOR
Swap agreement effective date Jul. 01, 2019
Cash Flow Swap 9 [Member]  
Derivatives, Fair Value [Line Items]  
Receive Rate one-month LIBOR
Derivative notional amount interest rate caps, remainder of fiscal year $ 62,500,000
Cash Flow Swap 10 [Member]  
Derivatives, Fair Value [Line Items]  
Receive Rate one-month LIBOR
Derivative notional amount interest rate caps, second year $ 93,750,000
Cash Flow Swap 11 [Member]  
Derivatives, Fair Value [Line Items]  
Receive Rate one-month LIBOR
Derivative notional amount interest rate caps, third year $ 78,125,000
Cash Flow Swap 12 [Member]  
Derivatives, Fair Value [Line Items]  
Receive Rate one-month LIBOR
Derivative notional amount interest rate caps, fourth year $ 37,500,000