v3.3.1.900

Share-Based Compensation - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum term of stock option	10 years
Amendment effective date	Jun. 02, 2015
Share-based compensation expense	$ 7,954,000	$ 8,247,000	$ 5,901,000
Shares subject to stock options, granted	0	0	0
Shares subject to stock options, shares exercisable	38,525
Weighted average exercise price, outstanding	$ 12.00
Weighted average remaining contractual term, outstanding	1 year 10 months 10 days
Number of stock options exercised	0	0
Intrinsic value of the options exercised			$ 35,000
Tax benefit recognized related to the stock option exercises			0
Service period	3 years 6 months
Current fiscal year employer matching contribution description	We make a matching contribution equal to 100% of each pre-tax dollar contributed by the participant on the first 3% of eligible compensation and 50% on the next 2% of eligible compensation
Contributions to employee benefit plan	$ 404,000	$ 310,000	279,000
Primary [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer matching contribution, percentage	100.00%
Secondary [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer matching contribution, percentage	50.00%
Non Employee Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 735,000	749,000	630,000
2007 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
The maximum number of common stock	3,625,000
Forfeiture Benefit Adjustments Member [Member] | Executive Officers [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Forfeited stock awards		$ 1,100,000	$ 1,000,000
Nonvested Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares grant	1,278,329	992,919	377,379
Average grant date fair value	$ 6,200,000	$ 14,400,000	$ 8,600,000
Unrecognized compensation expense related to nonvested shares	$ 7,900,000
Nonvested outstanding weighted average remaining service period	3 years
Nonvested Shares [Member] | Executive Officers [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares grant	724,249	245,157	183,672
Additional share grant fair value	$ 4,500,000	$ 4,500,000	$ 4,400,000
Total Shareholder Return Performance Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Subsequent restricted share award	550,272
Fair market value of shares subject to performance conditions	$ 300,000
Cash Settled Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Subsequent restricted share award	1,100,543
Fair market value of shares subject to performance conditions	$ 1,000,000

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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