Income Taxes - Summary of Income Tax Contingencies (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Balance at January 1,	$ 7,943	$ 36,464
Additions for tax positions taken during the current year
Additions for tax positions taken during a prior year	405	407
Reductions for tax positions taken during a prior year		(124)
Settlements with taxing authorities	(7,030)
Reductions due to lapse of applicable statute of limitations		(28,804)
Balance at December 31,	$ 1,318	$ 7,943