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Income Taxes - Income Tax Expense (Benefit) from Continuing Operations, Less Noncontrolling Interest (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$ 10,195us-gaap_CurrentFederalTaxExpenseBenefit	$ 11,962us-gaap_CurrentFederalTaxExpenseBenefit	$ 12,930us-gaap_CurrentFederalTaxExpenseBenefit
State	1,916	1,546	2,377
Total Current	12,111us-gaap_CurrentIncomeTaxExpenseBenefit	13,508us-gaap_CurrentIncomeTaxExpenseBenefit	15,307us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	2,187	1,448	1,955
State	215	903	249
Total Deferred	2,402lhcg_DeferredIncomeTaxExpense	2,351lhcg_DeferredIncomeTaxExpense	2,204lhcg_DeferredIncomeTaxExpense
Total Income Tax Expense (Benefit)	$ 14,513us-gaap_IncomeTaxExpenseBenefit	$ 15,859us-gaap_IncomeTaxExpenseBenefit	$ 17,511us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.