Investments in Joint Ventures - Assets, Liabilities and Shareholders' Equity of Joint Venture (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets:
Current assets (includes receivables from related parties of $187 and $935, respectively)	$ 7,856	$ 8,332
Noncurrent assets	16,080	28,993
Total assets	23,936	37,325
Liabilities and Shareholders' Equity:
Current liabilities (includes liabilities to related parties of $3,651 and $17,230, respectively)	4,551	17,455
Noncurrent liabilities (includes liabilities to related parties of $813 and $0, respectively)	813	0
Shareholders' equity	18,572	19,870
Total liabilities and shareholders' equity	$ 23,936	$ 37,325