Corporate Office Relocation (Narrative) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
Restructuring Cost and Reserve [Line Items]
Gain (loss) on prior office leases	$ (10,498)	$ (10,498)
Corporate [Member]
Restructuring Cost and Reserve [Line Items]
Gain (loss) on prior office leases	$ (10,498)