Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Income Tax Contingency [Line Items]
Unrecognized tax benefits at beginning of period	$ 12,775	$ 16,026
Additions based on tax positions of current year	223	99
Reductions based on tax positions of prior years		(3,261)
Reductions based on lapse of statute of limitations	(11,718)	(89)
Unrecognized tax benefits at end of period	$ 1,280	$ 12,775