Leases - Summary of Selected Financial Data (Detail) (CPD NY [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
CPD NY [Member]
Condensed Financial Statements, Captions [Line Items]
Total revenue	$ 119,945	$ 106,655
Gross profit	8,840	7,543
Net income (loss)	(162)	68
Current assets	13,506		9,529
Noncurrent assets	25,083		21,326
Current liabilities	9,696		4,800
Noncurrent liabilities	$ 19,456		$ 21,624