Investments in Joint Ventures - Assets, Liabilities and Shareholders' Equity of Joint Venture (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets:
Current assets (includes receivables from related parties of $524 and $636, respectively)	$ 10,743	$ 9,431
Noncurrent assets	32,948	36,840
Total assets	43,691	46,271
Liabilities and Shareholders' Equity:
Current liabilities (include liabilities to related parties of $22,039 and $19,278, respectively)	22,156	22,498
Shareholders' equity	21,535	23,773
Total liabilities and shareholders' equity	$ 43,691	$ 46,271