Stockholders' Equity - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended	6 Months Ended			0 Months Ended				6 Months Ended	0 Months Ended			0 Months Ended	6 Months Ended	0 Months Ended				3 Months Ended	6 Months Ended	12 Months Ended
	Apr. 08, 2013	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 2.25x Performance Restricted Shares [Member]	Jun. 30, 2014 2.75x Performance Restricted Shares [Member]	Aug. 12, 2014 Subsequent Events [Member]	Apr. 24, 2013 Senior Notes [Member] Prior to December 1, 2014 [Member]	Jun. 30, 2014 Senior Notes [Member] Prior to December 1, 2014 [Member]	Apr. 24, 2013 Term B Loan [Member]	Apr. 24, 2013 Initial Public Offering [Member]	Apr. 24, 2013 Initial Public Offering [Member]	Apr. 24, 2013 Initial Public Offering [Member] Senior Notes [Member]	Jun. 30, 2014 Initial Public Offering [Member] Senior Notes [Member]	Apr. 09, 2014 Underwriters Option to Purchase Additional Shares [Member]	Apr. 24, 2013 Underwriters Option to Purchase Additional Shares [Member]	Apr. 09, 2014 Secondary Offering [Member]	Dec. 17, 2013 Secondary Offering [Member]	Jun. 30, 2014 Secondary Offering [Member]	Jun. 30, 2014 Secondary Offering [Member]	Dec. 31, 2013 Secondary Offering [Member]	Apr. 09, 2014 Secondary Offering [Member]	Dec. 17, 2013 Secondary Offering [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares issued		89,958,264	89,958,264		89,900,453																		0	0
Unvested shares of common stock		3,304,975	3,304,975
Stock split description			On April 7, 2013, the Company's Board of Directors authorized an eight-for-one split of the Company's common stock which was effective on April 8, 2013. The Company's historical share and per share information has been retroactively adjusted to give effects to this stock split.
Stock split conversion ratio	8
Common stock, par value		$ 0.01	$ 0.01		$ 0.01
Common stock, shares authorized		1,000,000,000	1,000,000,000		1,000,000,000
Preferred stock, shares authorized		100,000,000	100,000,000		100,000,000
Preferred stock, par value		$ 0.01	$ 0.01		$ 0.01
Shares of common stock issued through initial public offering, shares												10,000,000						0
Shares offered and sold by the selling stockholders												19,900,000				2,250,000	3,900,000	17,250,000	18,000,000
Net proceeds received from offering												$ 245,400,000
Net proceeds received used to redeem 11% Senior Notes														140,000,000
Redemption price for Senior Notes percentage									111.00%	100.00%
Senior Notes redemption terms															A provision in the indenture governing the Senior Notes that permits the Company to redeem up to 35% of the aggregate principal amount of the Senior Notes with the net cash proceeds of certain equity offerings.
Payment made to affiliate for termination of Advisory Agreement													46,300,000
Net proceeds from offering to repay the outstanding debt											37,000,000
Secondary offering costs		73,000	747,000																	73,000	747,000	1,407,000
Number of shares repurchased		3,250,000	3,250,000		1,500,000																	1,500,000	1,750,000
Treasury stock at cost		94,869,000	94,869,000		44,163,000															44,163,000	44,163,000	44,163,000	50,706,000
Dividends paid to common stockholders			35,407,000	184,000
Dividends payable		18,590,000	18,590,000		17,939,000
Dividends payable						1,470,000	1,470,000
Share repurchase program, authorized amount								$ 250,000,000
Share repurchase program, beginning date								Jan. 01, 2015