Subsequent Events - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		1 Months Ended	0 Months Ended
	Mar. 31, 2014 Secondary Public Offering	Mar. 31, 2014 Senior Secured Credit Facility Term B-2 Loan, variable, due 2017	Apr. 25, 2014 Subsequent Event Secondary Public Offering	Apr. 14, 2014 Subsequent Event Refinancing of Line of Credit Senior Secured Credit Facility Term B-2 Loan, variable, due 2017	Apr. 14, 2014 Subsequent Event Refinancing of Line of Credit Senior Secured Credit Facility Term B-2 Loan, variable, due 2017 LIBOR	Apr. 14, 2014 Subsequent Event Refinancing of Line of Credit Senior Secured Credit Facility Term B-2 Loan, variable, due 2017 Prime Rate or Federal Funds Rate Plus 0.50%	Apr. 14, 2014 Subsequent Event Refinancing of Line of Credit Senior Secured Credit Facility Term B-2 Loan, variable, due 2017 Federal Reserve Bank of New York
Subsequent Event [Line Items]
Credit facility refinanced amount		$ 423.5		$ 423.5
Debt due date				Aug. 07, 2017
Applicable margin over base rate					2.75%	1.75%
Variable interest rate							0.50%
Secondary offering of common stock	28,750,000		25,000,000
Common stock, price per share	$ 29.17		$ 29.78
Ownership of outstanding common stock, percentage			25.20%