Reconciliation of Income Tax Expense With Expected Amounts Based Upon Statutory Federal Tax Rates (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Investments, Owned, Federal Income Tax Note [Line Items]
Expected federal income tax at statutory rate	$ 33,668	$ 34,896	$ 44,788
State income taxes before valuation allowance, net of federal tax effect	(357)	440	1,013
Income (losses) without tax expense (benefit)	22	(40)	(1,357)
Effect of foreign source income	(10,583)	(5,314)	1,959
Valuation allowance	445	358	(41,038)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Research and Development, Amount	(3,233)	(790)	(1,412)
Other items, net	1,707	1,331	264
Income tax expense	$ 21,669	$ 30,881	$ 4,217