Stock-Based Compensation Narrative (Detail) (USD $)	3 Months Ended			3 Months Ended			4 Months Ended	3 Months Ended			4 Months Ended	3 Months Ended	4 Months Ended	12 Months Ended	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Jun. 28, 2013	Dec. 31, 2013 Restricted Stock	Dec. 31, 2012 Restricted Stock	Dec. 31, 2012 Restricted Stock Senior Management	Dec. 31, 2011 Restricted Stock Senior Management	Dec. 31, 2013 Restricted Stock Senior Management Maximum	Sep. 30, 2011 Restricted Stock Senior Management Maximum	Dec. 31, 2012 Restricted Stock Senior Management Awards Subject to Service Criteria	Dec. 31, 2011 Restricted Stock Senior Management Awards Subject to Service Criteria	Dec. 31, 2012 Restricted Stock Senior Management Awards Subject to Performance Criteria	Dec. 31, 2011 Restricted Stock Senior Management Awards Subject to Performance Criteria	Sep. 30, 2013 Restricted Stock Senior Management Awards Subject to Performance Criteria	Dec. 31, 2013 Employee Stock Purchase Plan	Dec. 31, 2012 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stocks granted				1,332,000		1,332,000	1,183,500			523,875	524,250	808,125	659,250	448,290
Total compensation expense on awards	$ 2,754,000	$ 2,511,000		$ 2,641,000	$ 2,384,000			$ 20,200,000	$ 7,400,000						$ 113,000	$ 127,000
Closing stock price			$ 10.49
Fair value of restricted stock awards vested				3,100,000	2,900,000
Unrecognized compensation cost				$ 18,500,000
Unrecognized compensation cost, estimated weighted average amortization period				1 year 11 months