Investments - Summary of Assets, Liabilities and Results of Operations for Significant Unconsolidated Joint Ventures (Detail) (Significant Unconsolidated Joint Ventures, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Significant Unconsolidated Joint Ventures
Schedule of Investments [Line Items]
Current assets	$ 246,795	$ 313,446
Noncurrent assets	181,509	198,776
Total assets	428,304	512,222
Current liabilities	81,613	100,469
Noncurrent liabilities	63,585	77,734
Total liabilities	145,198	178,203
Net sales	609,728	598,459	601,233
Gross profit	167,156	169,406	165,650
Income before income taxes	102,764	101,652	105,329
Net income	$ 72,247	$ 71,294	$ 71,561