Related-Party Transactions - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	1 Months Ended		3 Months Ended			6 Months Ended
	Jun. 30, 2013	Apr. 24, 2013	Jun. 30, 2013	Jun. 30, 2012	Mar. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Related Party Transaction [Line Items]
Date of completion of IPO						Apr. 24, 2013
Termination of advisory agreement			$ 50,072			$ 50,072
Dividend declared to stockholders					500,000	18,072
Cash dividend declared	$ 0.20		$ 0.20	$ 6.07		$ 0.20	$ 6.07
Blackstone and Affiliates [Member]
Related Party Transaction [Line Items]
Advisory Agreement, fees			1,874	1,999		2,799	2,811
Termination fee paid	46,300	46,300	46,300			46,300
Write off of 2013 Prepaid advisory fees		3,772
Termination of advisory agreement		50,072
Dividend declared to stockholders	$ 11,749				$ 500,000