Stock-Based Compensation - Additional Information (Detail) - USD ($)		3 Months Ended			6 Months Ended
	Jan. 28, 2016	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2013	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock issued					17,889
Fair value of common stock issued					$ 400,000
Common stock, shares issued		85,707			85,707		85,459
Compensation expense		$ 6,200,000	$ 6,000,000		$ 13,800,000	$ 11,400,000
2006 EIP and 2013 LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock issued					625,389
Unrecorded and unrecognized compensation expense related to unvested share based compensation stock options		700,000	4,700,000		$ 700,000	4,700,000
Unrecorded and unrecognized compensation expense related to unvested share based compensation on restricted stock, Recognition period					1 year 3 months 18 days
2013 LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecorded and unrecognized compensation expense related to unvested share based compensation on restricted stock, Recognition period					2 years 7 months 6 days
Unrecorded and unrecognized compensation expense related to unvested share based compensation on restricted stock		$ 45,500,000	38,000,000		$ 45,500,000	38,000,000
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based payment award vesting period					4 years
Vesting Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage					25.00%
Restricted Stock Unit And Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based payment award vesting period					3 years 8 months 12 days
Shares issued					408,000
Fair value at the date of grant					$ 9,200,000
Performance-Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based payment award vesting period					2 years 8 months 12 days
Shares issued					199,500
Fair value at the date of grant					$ 4,500,000
Performance-Based Restricted Stock Units [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contingent right to receive common stock shares					0
Performance-Based Restricted Stock Units [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contingent right to receive common stock shares					1.75
Stock Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized				1,000,000
Common stock, additional shares authorized	1,000,000
Percentage of annual compensation designated by employees				50.00%
Maximum shares purchasable per person				2,000
Percentage of shares purchase price to market closing price				85.00%
Maximum voting power				5.00%
Maximum stock purchased to fair market value				$ 25,000
Common stock, shares issued		739,681			739,681
Compensation expense		$ 300,000	$ 300,000		$ 700,000	$ 700,000
Shares issued from the Employee Stock Purchase Plan, shares					182,285
Non-employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based payment award vesting period					1 year
Non-employee Directors [Member] | Initial Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based payment award vesting period					6 months