Schedule of Reconciliation of Defined Benefit Pension Plan (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	$ 104,074	$ 87,940
Actual return (loss) on plan assets	8,037	13,824
Employer contributions	0	7,786
Benefits paid	(5,042)	(4,946)
Administrative expenses	(600)	(530)
Fair value of plan assets at end of year	106,469	104,074	87,940
Benefit obligation at beginning of year	114,529	108,446
Service cost	1,060	1,144	1,162
Interest cost	4,528	4,659	5,047
Benefits paid	(5,042)	(4,946)
Actuarial (gain) loss	(11,517)	5,226
Benefit obligation at end of year	103,558	114,529	108,446
Other non-current assets	2,911	0
Other non-current liabilities	0	10,455
Total amounts recognized at end of year	$ 2,911	$ 10,455