Reconciliation of Total Segment Profit to Operating Income (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total segment profit	$ 148,944	$ 165,809	$ 188,527
Amortization of intangibles	9,347	9,594	10,225
Contingent consideration fair value adustment	(1,813)	0	0
Unallocated general and administrative expenses	47,173	56,771	51,424
Operating income	94,237	99,444	126,878
Other income, net	(1,958)	(259)	(1,086)
Income before income taxes and equity in net income of affiliates	$ 96,195	$ 99,703	$ 127,964