Income Taxes - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018 USD ($) States	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Income Taxes Disclosure [Line Items]
Federal Statutory rate (percent)	21.00%	35.00%	35.00%
Provisional income tax benefit related to remeasurement of deferred tax balances	$ 49,200,000
Impact on state apportionment percentage changes on income tax expense (benefit)	(1,200,000)		$ (4,800,000)
Operating loss carryforwards	$ 352,400,000
Operating loss carryforwards, expiration date start	2028
Operating loss carryforwards, expiration date end	2038
Net operating loss carryforwards, majority expiration date start	2024
Net operating loss carryforwards, majority expiration date end	2038
Number of states where net operating losses will likely be forfeited | States	6
Net deferred tax liabilities	$ 54,234,000	$ 82,696,000
Foreign tax credits	18,826,000	19,453,000
Australian net operating loss carryforward	1,300,000
Valuation allowance - tax credit carryforwards	16,100,000
Valuation allowance - tax credit carryforwards recorded in 2014	200,000
Income taxes paid	2,273,000	1,231,000	2,637,000
Unrecognized tax benefits	0
Goodwill impairment	17,729,000	0	$ 0
State and Local Jurisdiction [Member]
Income Taxes Disclosure [Line Items]
Operating loss carryforwards	$ 264,600,000
Operating loss carryforwards, expiration date end	2038
Valuation allowance - state NOL carryforwards	$ 6,105,000	$ 5,998,000
State and Local Jurisdiction [Member] | SEC Schedule, 12-09, Valuation Allowance, Operating Loss Carryforward [Member]
Income Taxes Disclosure [Line Items]
Valuation allowance - state NOL carryforwards	100,000
Australian Operation [Member]
Income Taxes Disclosure [Line Items]
Net deferred tax assets	3,600,000
Deferred tax assets, net operating loss	15,200,000
New Zealand Operation [Member]
Income Taxes Disclosure [Line Items]
Net deferred tax liabilities	$ 600,000