Financial Instruments - Summary of Outstanding Interest Rate Swaps (Parenthetical) (Detail) - Interest Rate Swap [Member]	12 Months Ended
	Dec. 31, 2015 USD ($)
Derivatives, Fair Value [Line Items]
Interest rate swap, description of interest received	Interest that varies with the one-month LIBOR
Derivative, Type of Interest Rate Paid on Swap	Fixed
June 2015 [Member]
Derivatives, Fair Value [Line Items]
Notional value	$ 25,000,000
Interest rate swap, expiration date	2015-06
Maturity Tenure Two Years [Member]
Derivatives, Fair Value [Line Items]
Notional value	$ 10,000,000
Interest rate swap, fixed interest rate	0.885%
Maturity Tenure Three Years [Member]
Derivatives, Fair Value [Line Items]
Notional value	$ 15,000,000
Interest rate swap, fixed interest rate	1.155%
Maturity Tenure Five Years [Member]
Derivatives, Fair Value [Line Items]
Notional value	$ 25,000,000
Interest rate swap, fixed interest rate	1.30%