Quarterly Results (Unaudited) - Schedule of Quarterly Income Statement Including Basic and Diluted Earning Per Share (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended					12 Months Ended
	Sep. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]
Impairment charges	$ 2,974		$ 882	$ 1,930		$ 3,726	$ 4,227	$ 3,123
Agreement charges					493	253	473	845
Lease termination charges		3,063
Income tax (benefit) expense			$ 80,790			$ 6,104	$ (80,904)	$ 10,328