Financial Instruments and Fair Value Measurements - Fair Value Measurements for Assets and Liabilities at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financial assets
Interest rate swap	$ 214
Financial liabilities
Interest rate swap		$ 1,964
Level 1
Financial assets
Interest rate swap	0
Financial liabilities
Interest rate swap		0
Level 2
Financial assets
Interest rate swap	214
Financial liabilities
Interest rate swap		1,964
Level 3
Financial assets
Interest rate swap	$ 0
Financial liabilities
Interest rate swap		$ 0